Version history

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July 16, 2024

  • Improvement: Automatically installes the often missing V++ Redist install .exe

  • Improvement: Less system resource intensive AV implementation

July 12, 2024

  • Improvement: Automatically installes the often missing V++ Redist install .exe

June 14, 2024

  • Improvement: New version of POP3/SMTP libraries included for more compatibility with extended email header fields

June 10, 2024

  • Bugfix: Shows correct error message instead of .NET exception for situations where IMAP mail downloads fail

May 19, 2023

  • Improvement: Installing VC++ Redistributable package as part of the POPcon installer

  • Improvement: Debug information about installed dot net and VC++ redist logged in internals.log

May 03, 2023

  • Bugfix: Function to silently drop specific recipients fixed

May 01, 2023

  • Bugfix: Unicode character /uDEF3 in subject lines caused crashes during mail download - fixed.

  • Bugfix: Archiving issues with/without SPAM tags resolved.

  • Bugfix: Exception in "Import_File string replacement" (occurs after moving files to the pickup folder) fixed.

  • Improvement: Increased compatibility of the antivirus system with various systems through automatic installation of support files.

April 16, 2023

  • Bugfix: Installation problems due to missing x64 version of Antivirus fixed by including the files in the installation

April 13, 2023

  • Bugfix: Installation problems due to missing x64 version of Visual C++ redist library fixed by including the files in the installation

April 11, 2023

  • Bugfix: Problems starting the library Chilkat solved by updating library and using x64 version

April 07, 2023

  • Bugfix: Previous versions overwrote the template for the notification email on moving non-transferrable emails to BADMAIL folder.

April 03, 2023

  • Enhancements: Additional log details for internals.log

April 02, 2023

  • Bugfix: Minor changes to error handling code

June 30, 2022

  • Improvement: Timeout extended for connections to POP3 servers. Now using timeout from configuration of the mailbox instead of a fixed 30 seconds timeout. Also: Error message improved for servers not answering to the connection request inside timeout.

  • Bugfix: PRO version now states that Antivirus is disabled when AV update time rolls around.

June 05, 2022

  • Bugfix: Antivirus updates

January 26, 2022

  • New: POPcon now also supports the mail header "X-FORWARDED-FOR" for the automatic distribution of emails from catch-all mailboxes.

January 20, 2022

  • Bugfix: Antivirus data files update not working on some client installs

July 03, 2021

  • Bugfix: Prevent exception for trying to archive an email that was just deleted by a rule

  • Antispam blacklist/whitelists automatically sorted displayed

  • Configuration forms are now resizable

  • Configuration forms can now be exited with ESC

  • Bugfix: Button on/off for accounts now only available if an account was selected

  • Config accounts: CTRL+A now selects all accounts

  • Bugfix: RULE sorting with up/down button did not work

  • Bugfix: Rules can now trigger on recipient even for fixed address accounts

April 11, 2021

  • New: Parallel download of multiple POP3 or IMAP mailboxes at the same time (PRO)
  • Improved download speed
  • Solved problems with timeouts when downloading emails with extremely large attachements
  • Solved problems with TLS1.2 encrypted connections

November 17, 2016

  • Improved: Long file names in MIME headers now detected correctly for the RULES function 

October 16, 2015

  • Improved: Timeout problems during transfer of emails to Exchange (2013) solved. These were caused by somewhat abnormally formatted OK acceptence messages back from Exchange for these specific emails.

April 20, 2015

  • Bugfix: Inefficient memory management for the list of emails kept on POP3 servers caused huge memory usage in previous versions - fixed.

April 17, 2015

  • Bugfix: The previously used OpenSSL library version seems to have caused slow connections and even crashes, especially on virtual machines. This version of POPcon now uses the most current OpenSSL v1.02a library to improve the SSL speed and solves stabilty issues.

March 25, 2015

  • Improved: SSL connections speed up by storing the SSL connection parameters found to be good in the registry after the first pass and used automatically subsequently.

March 10, 2015

  • Improved: New OpenSSL Library v1.02 used to speed up SSL connections

October 24, 2014

  • Improved: Connection speed to SSL POP3 servers improved by caching the SSL parameters instead of retrying different connection parameters every time POPcon connects to the same server. This is especially important since some providers switched off SSLv3 support in favour of TLS.

September 09, 2014

  • Improved: SSL  protocol version handling when communicating with servers with multiple SSL version implementations

April 12, 2014

  • Bugfix: Problem with new SSL libraries incompatibility with some systems solved. Error message was "unknown error". Upgrade if you experience this particular error.
  • Bugfix: Under some circumstances POPcon would load old messages again if you switch from "leave messages on hosts for n days" to "delete messages after downloadng". Fixed.

April 11, 2014

  • Improved: Now using v1.0.1g version of SSL libraries with "Heartbleed" fix

January 29, 2014

  • Improved: Now using latest version of SSL libraries to solve problems with Sophos (and other) firewalls when connecting via POP3-SSL to provider servers

August 14, 2013

  • Bugfix: Problems with connection tab (HTTP proxy username and password) fixed.

June 13, 2013

  • Improved: New Email header for finding target addresses included: X-Orig-To
  • Improved: Added support for ESET antivirus greylisting feature. Emails that get rejected with the SMTP error message "451 4.7.1 Please try again later" will automatically be retried.

March 14, 2013

  • Improved: Interference from antivirus and backup software could cause access to the database of already downloaded emails to be blocked and subsequently cause POPcon to download all old emails again in accounts where you leave emails on the POP3 server. This version adds repeated attempts to read the database file and a new secured backup database file to solve this.
  • Bugfix: Swiched on all antivirus engine testing options - older versions would not see virus files that was packed in some nested special archive formats.

January 22, 2013

  • Bugfix: "Remove strings from start/end of recipients" feature did sometimes remove the same strings from the sender/FROM address as well - fixed.
  • Bugfix: Possible early deletion of emails in case more emails than allowed to download in one pass are on the server and the server doesn't correctly answer on the UIDL command - fixed.

April 20, 2012

  • New: Automatic removal of emails that are 0 bytes long (usually caused by antispam or antivirus products)
  • New: Special support for scanner/fax devices that always email with the same message id (Dell MFP for example) by switching off the Message-ID duplicates filter for those.
  • New: Archive to different folders for each account in PRO version
  • Improved: Don't spam-check emails more than once in case the transfer to exchange is interrupted and delivery of the same email is attempted again later.
  • Improved: Adds additional header field "x-original-from" if the FROM address was invalid and replaced with unknown@unknown.com
  • Improved: Don't deliver same email twice if once delivered normally (for TO: address) and second delivery would be due to CC or BCC address in same email causing a reroute due to unknown address or POPcon PRO rules
  • New: Support for "554 Too many Received: headers" SMTP error message now causes email to go to BADMAIL folder
  • New: Filtering of "env-from" part of received..for headers. That part is not taken as TO: address
  • New: Special support for emails from voicemail systems: Filename voicemal.wav and voice.wav of attachments are modified to stop Outlook from wrapping around at voicemail.wav(99) back to voicemail.wav(1). Users needed to manually clear Outlook caches because of this Outlook bug.
  • Bugfix: Stop repeated mail cycles at complex schedule times

September 30, 2011

  • New: Allowed new minimum "0" minutes cycle time for continuous downloading and forwarding of emails
  • Improved: popcon_addaccount utility now supports the "display name" parameter to update the display name used in the logs

February 09, 2011

  • Added processing of X-Greylist header field supporting antispam system SQLGrey

December 06, 2010

  • Added several new header fields, i.e. X-RZG-FWD-BY for strato, X-Forwarded-Original-Recipient
  • Added handling of several new SMTP error return codes from antispam and antivirus SMTP filters
  • Improved handling of multi-line received..for headers to find more BCC recipients
  • Reduced problems caused by software blocking UID-Database files of POPcon by keeping a 2nd copy
  • Eliminated false detection of duplicate messages by shortening the keep period for Message-IDs and for taking into account more message header fields in the detection algorithm
  • Bugfix: Keep uids from being deleted by turning off and on POP3 accounts
  • New: Added filter to allow only one line of REFERENCES header to pass through to Exchange because Exchange 2007, 2010 can't cope with multi-line References headers
  • New: Installer now uses signed self-extracting .exes.

September 08, 2008

  • New: Support for Windows 2008 - old versions would not install proper on Windows 2008.
  • New: Extended Support für Exchange 2007 Server: All new SMTP-returncodes (blocked because of Spam, etc.) are now supported.
  • New: Archive function for incoming emails. Emails now can be archived into folders on the server.
  • New: Download specific POP3 accounts less often, i.e. only every 3rd or 10th mail cycle. Useful for free mail accounts that limit number of access per hour.
  • Improved: Empty "" or <> fields in the sender addresses are now automatically corrected.
  • Improved: White- and blacklists: Delete all entries function.
  • Bugfix: [SPAM] tag now also in cyrillic or chinese emails without affecting rest of email.
  • Bugfix: Old emails are not re-downloaded when switching from keeping emails on server to deleting them after download.
  • Bugfix: Underline character are allowed in specific positions in email addresses.

December 07, 2006

  • New: Added a display name you can set for the individual POP3 mailboxes not related to the login data
  • New: Antiviruscheck is now a separate pass after download of all emails
  • New: Automatic removal of the "|" character from email addresses (Exchange does not accept them)
  • New: X-POPCON-SPAMCHECK email header is added to each email during antispam checking
  • Improved: Error handling in case the email is not accepted by Exchange:
    • Added retries to the SMTP-to-Exchange pass if Exchange does not accept an email
    • Added support for Exchange return code "554 5.1.0 Sender Denied" after the DATA command
    • Added support for SMTP return code "550 Your message was not delivered for policy reasons" (for product "No Spam Today")
    • Added support for SMTP return code "550 Invalid recipient/sender mailing address" (for product esafe 5.0)
    • Added support for SMTP return code "550 5.7.1 Rejected - message has spam signature" (for product "clearswift")
  • Bugfix: envelope-sender tag in the received..for header is no longer evaluated for recipients
  • Bugfix: [SPAM] tagging now works with emails that (wrongly) have multiple "Subject:" header lines
  • Bugfix: UID-Cache of already downloaded emails not longer used when configured to not leave emails on the POP server

August 30, 2006

  • Improved: Handling of Exchange dropping connection - "Mail transfer to Exchange failed, reason: Connection was unexpectedly closed"
    The new version improved handling of situations where the Exchange Server drops the SMTP connection due to SPAM, recipient or sender filter activated.
  • New: Added handling of several previously unknown SMTP error codes from Exchange when the transmitted email is not accepted:
    "421 4.1.0 Dropping connection due to an error on this server" - happens when an email with a special problem in the header arrives.
    "550 5.7.1 Blocked by..." - Antispam
    "550 5.7.1 Sender ID (PRA) Not Permitted" - Antispam, Sender-ID check failed
    "550 5.7.1. Rejected" - clearswift support
    "553 5.1.8 <recipient>... Domain of sender address ... does not exist" - clearswift support
    "554 5.7.1 Message cannot be accepted, spam rejection" - merak, antispam
    "550 5.7.1 Mail to big" - unknown source
  • Bugfix: Problem with handling email lines without proper EOL characters
    Fixed problem that could occur with TYPO3 and other formmailers
  • Bugfix: Multiple active rule for same trigger problem
    Fixed a problem causing only one rule of multiple active rules on the same trigger to fire.

July 28, 2006

  • New: Special POPcon NOTES variant for Lotus Notes Domino Server.
    This variant of POPcon is tailored for usage with Domino. It handles Domino SMTP Messages that indicate a non-existing recipient like "550 <<>>... No such user".
  • New: Wordlists for user-defined blacklists and whitelists can now be exported and imported to/from textfiles
    This feature was on the top of our wishlist because so many of our users asked for it.
  • New: Support for "X-MailScanner-To" and "X-Rcpt-Original" Header
    These two email headers often contain BCC and recipient addresses and are now supported.
  • New: Remove read receipt requests from incoming emails
    This feature removes read receipt requests from incoming emails and allows administrators to keep read receipts enabled internally while stopping external read receipt requests.
  • Improved: Support for very long multi-line "received..for" headers
    Previous versions could have problems detecting all recipients from very long "received..for" headers. This version corrects the problem.
  • Improved: Support for Exchange blocking emails because of IMF
    Exchange can block incoming emails because matches in the intelligent mail filter or because of sender IP address. This version of POPcon allows the administrator to configure POPcon's reaction to the various SMTP errors in these cases. POPcon can move messages into a BADMAIL folder, delete them or retry them.
  • Improved: Lowercase characters only in recipient addresses.
    Strangely Exchange sometimes does not match the recipient addresses for emails sent to email-enabled public folders when the recipient address relayed by POPcon is not all lowercase letters. This version of POPcon converts all recipient email addresses to lowercase before relaying them to Exchange.
  • Bugfix: Tagging messages as [SPAM] did not work without Subject header
    Older versions of POPcon could not tag spam messages as [SPAM] in the subject if they were sent without a subject tag in the mail header. Corrected in this version.
  • Bugfix: Problems with the name resolution of the SMTP/Exchange server could crash POPcon
    Older version could crash in case the SMTP/Exchange server name entered in POPcon could not be resolved into an IP address. Fixed in this version.
  • Improved: Can now work with reused UIDs in POP3 comms
    Older versions could get confused about which emails were already downloaded when ISP's POP3 server reused UIDs in the POP3 communications. This version assigns life spans for UIDs and no longer has this problem.
  • Improved: Handles message/partial MIME tags
    Exchange seems to no longer accept message/partial emails - POPcon now detects this rejection and handles it like other IMF rejections.

February 23, 2006

  • Bugfix: Mail download timeout with very large attachments
    A timeout could occur during the download of emails with very large attachments due to slow processing of antivirus scans. Fixed in this version. 
  • Bugfix: Max. Length of mail setting in rules interpreted incorrect
    The maximal length of mail to checked against certain rules and black-/whitelist entries was misinterpreted in previous versions.


February 13, 2006

  • Improved: Support for multiline TO: Mailheaders
    POPcon now scans TO: Headers even if they are strangely formatted and go over many lines. Earlier versions could stop processing after a certain number of TO lines.
  • Bugfix: Memory-leak in SSL code
    A memory leak in the SSL code that did only surface under certain circumstances was found and solved. Update to this version if you experience excessive memory usage by the POPconSrv.exe process.
  • Improved: "503 5.5.2 Sender already specified" problem fixed with recipient filtering active
    Version 3.40 could provoke this error message from Exchange if multiple emails were rejected by the Exchange recipient filtering option.
  • Bugfix: Off-by-one error fixed in Number of mails downloaded in one pass
    The max. number of mails downloaded in one pass option on the POP3/IMAP configuration screen was interpreted wrongly - off by just 1.
  • Improved: Display of (PRO) rule that was activated
    POPcon PRO now displays the rule that was activated to reroute/delete/forward a certain email in the log.
  • Improved: IMAP download with no mail on server
    No mail on an IMAP host could cause delays and timeouts in earlier versions.
  • Improved: IMAP download does not mark messages read
    POPcon now uses a different IMAP command to read the new mail to not mark downloaded emails as read.
  • Improved: "Remove string from start of recipient addresses" function
    This function now successfully handles email addresses prefixes with an additional "@" somewhere.

January 30, 2006

  • Improved: POPconAdmin dialog finally resizable
    That was the one feature most often asked for: Make the POPconAdmin dialog resizable so we can see a larger portion of the log on our big mean 24 inch flatpanel screens!
  • New: "X-MailHub-Apparently-To:" header
    This header was added to POPcon's list of email header fields processed for recipient addresses upon customer request.
  • New: "String found in Header fields" condition
    You can use this feature to have POPcon PRO scan the email headers for certain strings in the mail headers as a precondition for the execution of a rule or as condition to tag email as SPAM.
  • Improved: Notify postmaster if mail is moved to TOOLARGE folder
    POPcon now sends a notification email to the postmaster address (general configuration tab) if an incoming email is blocked by your Exchange Server because it is too large. POPcon moves such emails into a folder named TOOLARGE.
  • New: Daily log files
    POPcon keeps a log file (c:\program files\POPcon\POPconSrv.log) that is shortened daily to a manageable size. Now you can configure POPcon to instead keep daily log files (POPconSrvDATE.log).
  • New: Support for Exchange recipient filtering
    Serveral customers asked for this: Before version 3.40 POPcon would tirelessly try to forward an email to exchange again and again even if exchange did not accept it because the recipient did not exist and the administrator had recipient filtering enabled in the Exchange configuration. This version now supports this exchange feature and drops the email if no recipient is accepted by Exchange.
  • Improved: Wrong message length ignored
    POPcon now ignores it when the message size of the received email differs from the size originally advertised from the POP3 server during the LIST command. This often seems to happen when antivirus- or antispam-enabled firewalls remove attachments from emails downloaded by POPcon.
  • Improved: Message download timeouts
    This version accepts "stall" messages from antivirus-enabled routers and firewalls that need a way to keep the timeout timers from stopping a download stalled during antivirus-checking by the firewall.
  • Improved: Antivirus signature download
    POPcon now uses the HOST header inside the HTTP downloads of antivirus signatures, resulting in much less problems with routers and firewalls.
  • Improved: Rules engine: copy to multiple destinations
    POPcon PRO now works correctly when multiple Rules fire on a single email causing copies of the mail to be sent to multiple recipients.
  • Improved: String removal case-insensitive
    The pattern matching for the "remove string from start/end of recipient address" features (Advanced configuration tab) is now case insensitive.
  • Improved: Antivirus check of 7bit files
    POPcon PRO now also checks 7bit attachments for virus contents. Some EICAR testfiles are actually sent as plain text (7bit encoded) files and were not detected in earlier versions

November 23, 2005

  • Improved: Better virus detection
    Now also securely finds virus code inside intentionally misformated MIME emails like in some Sober.y variants.


November 02, 2005

  • Bugfix: Antivirus signature updates
    Problems during antivirus signature updates solved. Previous versions could have problems when antivirus signature dlls did not unload fast enough before being overwritten with newer versions.

  • Improved: More options for local IP / NIC
    Apart from selecting individual local NICs / IP addresses as starting point for the network communications, v3.3 now also allows to use the Windows default and also offers to scan IP addresses for a possible connection.

  • Improved: Communication between POPcon Administrator and the POPcon service
    Previous versions used network / IP communication between POPconAdmin and the POPcon service. With todays firewalls and packet filters this is increasingly difficult. We changed the communication mode to a direct interprocess communication to solve many issues regarding configuring POPcon and the visibility of the POPcon server.

September 30, 2005

  • Improved: Handling of changing local IP addresses
    New local IP addresses are now automatically detected during the download cycle. This allows usage of POPcon in systems where the local IP address of the internet connections fequently changes. This often happens when the server is connected directly to the DSL line instead of via a router device.

  • Improved: Rerouting of mail to non-existing recipients
    If the rerouting is switched on but no target defined in the POP3 properties, POPcon now uses the postmaster address defined on the "general" configuration page instead.

  • Improved: Antivirus version display
    The antivirus version display is now refreshed directly after a unpdate of antivirus signatures took place.

  • Improved: Warning when antivirus update subscription ends
    Older versions had a warning that combined various sources of problems during the antivirus signature download. This version distiguishes between connection problems to the license server and an actual ended antivirus subscription.

  • Improved: Guard against corrupted antivirus signature files
    New antivirus signature files are only used when their CRC-Checksum conforms to a list of correct CRCs downloaded from the server. This keeps corrupted signature files (due to download problems or other antivirus software interfering) from being used.

  • Improved: Rules - find string function
    The find string in mail text function no longer searches the (MIME-coded) binary file attachements - this will keep false positives due to random byte and text combinations in the MIME coded files from happening.

  • Bugfix: IMAP protocol problem solved
    Two IMAP download issues with special servers where being solved - now multiline responses to the SEARCH IMAP command and parenthesis in the FETCH command are handled more robustly.

  • Bugfix: Crash when local IP was entered manually
    The old version could crash if a IP was entered manually on the Advanced configuration page that was not listed in the combobox before. This version allows this.


September 21, 2005

  • Bugfix: Failure to delete one of the antivirus dll files during antivirus signature update could stop POP3 download process under some circumstances - fixed.

September 19, 2005

  • New: Support for IMAP and IMAP-SSL mailboxes

    POPcon now downloads email from IMAP and IMAP-SSL mailboxes in addition to the POP3 and POP3-SSL protocols it already supports. The new IMAP support can be used to download AOL email to Exchange while POP3-SSL is already used to download mail from GMail accounts.

  • New: New antivirus engine

    Since the supplier of the old engine (RAV) was sold to Microsoft the antivirus signature updates are no longer provided. This version includes a new antivirus engine that updates itself from the internet and can be configured to check for new signatures every hour. The signature download process was also improved: The new version now uses HTTP download exclusively and will cause much less problems with firewalls and proxy servers.

  • Improved: Antispam function

    The antispam function now ignores certain notorious email header fields that contained numbers formatted like IP addresses which were in fact not IP adresses but DLL versions. The new version no longer checks these numbers as if they were IP addresses of possible spam sources.

  • Bugfix: Memory-Leak in one of the libraries we use corrected.

  • Bugfix: POPcon service crash due to communication problems with POPcontrigger or POPconAdmin solved.

July 26, 2005

  • New: Processing of TO/CC header can be switched off

    In some environments it is better for POPcon not to process the TO and CC header lines in search of the correct recipient but instead to rely on other mail headers like Delivered-To etc. In this version you can switch of processing of TO and CC headers separately on the advanced configuration tab.

  • New: Mail header X-XS4ALL-TO now supported

    With some providers, this header field contains the actual mail recipient address. POPcon v3.10 now supports this field, again on the advanced configuration tab.

  • Improved: Antispam function

    When checking for spam, this version now checks the (smaller) Whitelist and in case of a positive match skips the time-consuming blacklist DNS lookups and blacklist checks.

  • New: Maximum number of emails downloaded in one pass now configureable

    You can now configure the maximum number of emails downloaded from a POP3 server in a single pass. POPcon will stop downloading at this number and forwards the already downloaded emails to your exchange server first, then continues to download the rest of the emails waiting on the server in the next pass. A low number here comes in handy when the POP3 server was down for some time or your internet connection broke. Upon reconnecting your users will not have to wait for the first piece of email to arrive after all 16.000 emails have been downloaded – the first emails will come in after only this number of emails have been downloaded.

  • New: Select a network card for external and one for internal network access

    If you have more than one network interface card (NIC) in your system you can choose the local IP address that POPcon should use to connect to external addresses on the internet like the POP3 servers and choose another for internal network accesses to your Exchange Server. This is important if only one of the cards is actually connected or allowed to connect to the internet by your local firewall or router.

  • Bugfix: Memory-Leak in one of the libraries we use corrected.

  • Bugfix: Wrong language in one of the helpfiles corrected.

May 16, 2005

  • Bugfix: Problems with increasing memory and CPU usage solved.

  • New Feature: Number of mails downloaded in one pass now configureable via registry entry.

April 26, 2005

  • Bugfix: Problems when installed under Windows NT 4.0 solved.

April 22, 2005

  • New: Catch-All function for unknown recipients from domain-wide POP3 mailboxes

    Normally, the Exchange Server will return an NDR (non-delivery report) to the sender of every email directed to an address that is not defined in the Active Directory. If you do not want this, use this new POPcon option to have POPcon check the AD for every recipient and substituting a postmaster address for the recipients that can not be found in the AD. Not available in Windows NT 4.0 installations!

  • New: POP3 over SSL

    POPcon v3.00 now supports SSL connections to POP3 servers. Use this options to connect to certain POP3 servers (i.e. GMail) that only support encrypted transfers.

  • Improved: Support for additional mail headers

    The new version checks more mail headers than ever for the best compatitbility with the widest range of POP3 servers and setups: X-REAL-TO, X-ORIGINAL-TO, X-RECIPIENT, X-TO, X-LYRIS and X-APARENTLY-TO are now added to the list of headers processed in POPcon. You can even configure which of the headers should be enabled on the "Advanced" configuration page.

  • Improved:  POPcon skips ahead to the next POP3 servers in it's list if a POP3 server is not reachable or any other error occurs with it.

  • Improved: Antispam function
    - POPcon now notes which entry in the user-defined black- or whitelist caused a mail to be tagged spam or not spam.
    - Blacklist servers now are verified to be working before they are used.
    - Blacklist checking for a particular email is stopped if it already is found to be spam..
    - IP is no longer blacklist-checked.
    - Spam-IP search now is restricted to the header of an email.

  •  Improved: You can now use regular expressions instead of fixed strings in the "Advanced" function "Remove string from start/end of email addresses".

  • Bugfix: Mail from some servers (freeservers.com) was under some circumstances identified to came from unknown@unknown.com in POPcon.

  • Bugfix: PRO-version rules-engine problems with the "only check if mail smaller than" function wer solved.  

March 10, 2005

  • New function: Auto-replacement of domain names in recipient mail addresses before transferring the email to Exchange.
    POPcon will only replace the domain name, keeping the address part before the “@” intact. You can use this feature to:
    • Map multiple external internet domains to the same internal domain without adding every external domain to the recipient policies and without adding all the email addresses to each user again.
    • Map an external internet domain to a local internal one without having to add the real internet domain to the Exchange recipient policies and so allowing Exchange to still send email out to the internet to this domain.
  • Bugfix: Storing of maximum length of message text to check in rules-based distribution fixed in this version.


March 05, 2005

  • Bugfix: Choosing the option "Delete SPAM" caused POPcon PRO to leave *.msg files in the POPcon folder on some systems.
  • Improved installation: v2.93 could not update the POPconAdmin on some systems causing problems updating the configuration after installation of an update.
  • Help file update: Advanced config helpfile updated.


March 01, 2005

  • New: POPcon can now leave Emails on the POP3 server for a specified time before deleting them on the server. This was a much-requested feature to support sharing of POP3 mailboxen between Exchange and external/traveling coworkers..
  • Improved mail download for incorrectly formatted (spam-) emails that include the "end of mail" tag in the mail text.
  • Improved configuration of supported mail headers in the advanced menu, including the Envelope-To header.
  • PRO-version: Moved the spam-IP check to after the end of  mail download to remove interference between slow DNS lookups and fast POP3 server timeouts.


February 24, 2004

  • Improved AV signature download.
  • Improved mail download with low quality connections and IP-blocking issues.


February 09, 2004

  • New: Support of Exchange maximum message size exceeded error - now causing too large message files to be sent to harddisk folder "toolarge".
  • New: Support for user-defined blacklists and whitelists for spam-detection.
  • New: Rules engine now allows search for phrase in whole message text
  • Improved AV signature download.
  • Added support web.de-specific mail headers.
  • If Mail is both virus and spam it now will be treated like a virus instead of like spam.
  • Better shielding against external antivirus software interference.
  • Bugfix: Delete Virus Emails option problems solved.


May 10, 2003

  • Bugfix: Solved problem with international characters introduced by Mac email filter from 2.88


May 01, 2003

  • Bugfix: Solved dialup problems with other v2.8x versions due to use of too recent dialup API.
  • New feature: Filters out special characters sent by some international (at least german, swedish) Macintosh MS Outlook versions in the MIME header that up until now caused emails from those clients to be parsed incorrectly by MS Exchange.
  • New feature: Now you can choose to delete virus-infected emails instead of just forwarding or tagging them.
  • New feature: Spam emails are now tagged [SPAM] also when forwarded to the spam operator email.


February 09, 2003

  • Problem with download of emails that are shorter than what the POP3 server announced corrected. Earlier versions sometimes had seemingly inexplicable timeouts when downloading such an email.

September 16, 2002

  • Bugfix: old 2.82 was linked to wrong library and cause problems with dialup networking, DNS name resolution and ftp anti virus updates.
  • Installation problem solved causing old DNSAPI.DLL to be installed in POPcon folder.

September 01, 2002

  • New: Supports HTTP proxy servers for the antivirus URL request
  • New: DNS MX records checked in virus-found autoreplys for more accurate antivirus sender determination.
  • New: Spam reply to sender implemented.
  • New: Advanced configuration: Received..for and Delivered-To header processing as well as eventlog entries configurable.

August 01, 2002

  • New: If other antivirus product delete POPcon's internal message files this does no longer cause POPcon to stop mail distribution. Instead the Postmaster is notified.

  • New: Antivirus files version and date are visible on the "license" screen.

  • New: PRO-Version: Sequence of user defined rules can now be changed.

  • New: PRO-Version includes new Antispam feature using blacklist-dns servers.

  • Bugfix: Multiple end-of-mail strings in emails are now filtered before forwarding the email to exchange.

  • Bugfix: FTP problems while downloading antivirus data other instable links now solved.

May 07, 2002

  • Standard-Version:

    • New: Enable/Disable pop3 accounts without deleting and adding again.

    • Bugfix: Apostrophes now allowed in mailaddresses. O'Donalds@scotland.uk will now get his mail as well.

    • Bugfix: Extremly long TO: headers now correctly evaluated.

    • Bugfix: "Filter by recipient domains" now looks for the *exact* domain instead of any domain name just beginning with a valid recipient domain name.

    • Bugfix: Communication between Admin und POPcon service now secured to solve problems on some client machines when transfering the configuration.

    • New: Improved errorhandling when internet connection stops working in the middle of the process.

  • PRO-Version:

    • New: POPcon now can send an email to the sender of a virus mail automatically.

    • New: Virusmails now go to a special "Virusoperator" instead to the standard postmaster account.

    • New: Viruswarnings now include virus type, sender and subject information.

    • Bugfix: Outdated RAV antivirus definition files are now cleaned up automatically. This solves a problem were some client's AV signatures stoped after Dec. 31th, 2001.

November 29, 2001

  • Antivirus scanner now scans *.msg directly, more MIME content types supported (audio, etc.)

  • problem solved when options are changed during running download and immediately called back
    own MIME wrapper instead of mimepp

November 07, 2001

  • Problems with some attachement types resulting in non-scanned files solved
    email temp file writes now cached to keep POPcon from using 100% cpu time while downloading

  • ";" now also possible in passwords and other configuration strings

  • no need to interrupt downloads when cumulative size of emails larger than 10MB, feature removed

  • editing configuration no longer leads to problems when done while mail download in progress

  • Added MDaemon special recipient header to be processed

  • X-Envelope-To and Envelope-To now supported without special configuration

October 22, 2001

  • now with correct dialup library. 2.68 was accidently linked with xp libraries.

October 12, 2001

  • Problem solved: Exchange stops mail receiving without returning warning if maximum mail size is exceeded. Now a warning message indicates this condition with POPcon.

  • Scanning algorithm improved - now also single file mails scanned correctly in addition to multifile ones.

August 06, 2001

  • Bugfix: POPcon could not be stopped when POPconAdmin was still running.