MultiSendcon Version History

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May 23, 2021

  • Improved: Now supports TLS1.2 and TLS1.3 connections

September 27, 2016

  • Improved: Now correctly shows first line of multi-line SMTP error messages

July 12, 2016

  • Improved: Detection of accessible local IPs now done with a more comprehensive method

April 19, 2016

  • Improved: Error handling for extremely large emails that cannot be read in one piece

December 14, 2015

  • Improved: New version allows email addresses with a name part ending on a minus sign (user-@domain.com) because some servers actually do accept these addresses even though they are not correct by the original email RFC's.

September 22, 2015

  • Improved: Prevents application exception caused by giant-sized emails and by extremly deeply levveled emails in the ndr queue caused by emails going round in circles through forwarding

September 08, 2015

  • Improved: Allows recipient email addresses with underscore character ("_") as last character of name part of email right before the @ (not actually allowed in RFC standards but sometimes still used)

August 11, 2015

  • Improved: Now accepts oddly formatted MAIL FROM commands without <> brackets around email address

July 18, 2015

  • Improved: Subject line in non-deliverable reports now shows reason the email could not be delivered

July 08, 2015

  • Improved: Admin tool automatically reconnects to background service in case connection is lost (i.e. if MultiSendcon service is restarted)

July 03, 2015

  • Bugfix: Some dialogs had misaligned fields after the last update - corrected

June 15, 2015

  • New: Now can replace SMTP envelope sender (MAIL FROM) with fixed sender email but leave the sender address in the email itself the same.

May 29, 2015

  • New: Passwords are now stored encrypted (AES standard) in the .cfg configuration file.

May 27, 2015

  • Bugfix: Formatting of NDR emails corrected.

May 21, 2015

  • New: Emails that are sent to multiple recipients are no longer split into individual emails to each recipient when send via SMTP relay servers but instead are forwarded as only one email with multiple recipients.

March 13, 2015

  • New: SMTP timeout can now be configured for each account (instead of fixed 30 sec. timeout)

March 10, 2015

  • Improved: No hangs dealing with temporary email files that are blocked  by some external virus scanning etc.

February 25, 2015

  • Improved: Now removes original email from NDRs if original too large to be accepted

  • Improved: Better error message if SMTP server returns verbose error message with html code

  • Improved: Now allows internals.log file to be switched off for data protection reasons

  • Bugfix: 45x "temporary" smtp error codes could cause emails stuck at 5 minute retry interval - now using normal retry limits

  • New: Now log file options on advanced config screen to allow daily log files and log file size limits to be changed

  • In Admin Test-Email now says [no connect] instead of just result code 0 when smtp relay server can't be reached

  • Disposition-Notification-To header now with <> around the email


January 14, 2015

  • New: New "advanced" configuration page with new parameter "limit concurrent sending threads". MultiSendcon uses multithreading to send multiple emails at the same time when many emails are in the queue. Some SMTP relay servers reject emails if too many concurrent connections are open. use this new limit to keep MultiSendcon from overloading your SMTP relay server.

January 09, 2015

  • Improved: Problems with Multithreading solved when sending Emails with many recipients

December 17, 2014

  • Improved: Connectivity with SMTP servers needing explicit SSL on port 465ยด

  • New: Special handling of smtp error message "421 invalid sender domain" as final instead of temporary

  • New: Special handling of smtp error message "421 Too much load": Will not limit retries for this message

  • Improved: Automatic retries for file access if temporary message files (stored by MultiSendcon after receiving the email from Exchange) is blocked by another process (antivirus, etc.)

November 06, 2014

  • Bugfix: Problem with parallel processing many retries or many NDRs at the same time solved.

September 10, 2014

  • Improved: Replace-Sender feature now also replaces Disposition-Notification-To header field so read notifications are sent back to the correct address

August 29, 2014

  • Improved: Prevents problems of previous versions when configuration is updated and simultaneously new emails are sent in.
  • Improved: More information logged in special log file for TLS/SSL connections

August 21, 2014

  • Improved error handling in case something (i.e. antivirus) blocks access to the temporary email files that MultiSendcon maintains. 
  • New: French language added
  • New: Portuguese (Brazilian) language added
  • New: Italian language added

August 14, 2014

  • New: Lets you specify a default sender address for emails that Exchange sends out with emtpy sender spec <> like out of office messages or non delivery reports. 
  • Improved: Fine-tuning of limits to concurrent threads for mass emailings.

May 08, 2014

  • Improved:: Now accepts 8-bit encoding in emails too in case special characters are encoded as 8-bit characters instead of HTML chars.
  • Improved: Software now automatically limits number of concurrent threads for mass emailings as to not overwhelm the processing.

May 06, 2014

  • Improved:: Communication between MultiSendconAdmin and the service had some size limits imposed by the windows communication framework that made configurations with more than 50 accounts impossible. We increased these restrictions so that  now configurations with several thousand accounts are possible.

April 18, 2014

  • New: MultiSendcon now uses multithreading to send out multiple emails at the same time for increased performance
  • New: Configureable wait time for each account to slow down throughput for relay servers that don't allow more than a certain number of emails per hour

April 03, 2014

  • New: Allow override of sender replacement feature by setting the sensitivity tag to "private" in emails. This feature can be switched on and off for each account.
  • New: Time until MultiSendcon gives up on retrying emails that get rejected with a temporary SMTP error code can now be configured on the NDR page.

March 28, 2014

  • New: This version lets you configure the email address that non-delivery reports (NDRs) come from.  

March 05, 2014

  • New feature: Replacement of sender addresses in outgoing emails with a fixed sender address. Can be used to have all employees send out emails as info@company.com for example.

February 11, 2014

  • Bugfix: Automatic repeat of sending for Code 45x temporary server errors didn't work for all codes - fixed.

February 01, 2014

  • Improved: IP port number can be anything now, not just 25/465/587
  • Bugfix: Sending of test emails didn't change outgoing IP address under some circumstances - solved.

January 13, 2014

  • Bugfix: Improved handling of partial recipient failures in multi-recipient emails

November 13, 2013

  • Improved: Extended error messages for failed test messages in the admin tool.

October 08, 2013

  • New: Additional configuration parameter: Email address to be used as sender for empty senders. Sometimes Exchange sends emails (NDRs for example) without any envelope FROM addres. This setting ensures those emails do get through relay servers by supplying a replacement sender address.
  • Improved: Now uses FROM address automatically if envelope-from is empty.
  • Bugfix/speed improvement: Solved high-volume race condition causing some stmp connections to be dropped.

August 22, 2013

  • Improved: Stricter binding of master smtp relay to configured IP port. Connection could be interrupted by other IP services claiming the same port in older versions.

July 30, 2013

  • Bugfix: Option "Use FROM address instead of SMTP envelope information" did not "stick" in some configurations - solved.

July 05, 2013

  • Bugfix: Specific email header combinations (like in emails from MFP scanning devices) caused problems with the forwarding of the attachments in the same email. Solved in this version.

June 20, 2013

  • Improved: Now supports SMTP relay servers that require explicit SSL/TLS encryption rather than just automatic implicit SSL/TLS based on IP port. The Office 365 smtp relay server for example require this option.

June 07, 2013

  • Improved: Now automatically removes the temporary X-MultiSendcon email header fields before sending out emails to the internet

March 04, 2013

  • Better handling of timed-out connections
  • "5 days trial left" warning no longer causes loss of configuration data

February 20, 2013

  • New: Now you can select the "HELO/EHLO domain" for each account individually. This is the domain name that MultiSendcon uses to sign on to the SMTP relay or target SMTP server with the HELO or EHLO command. If you leave it blank MultiSendcon will just pass-through the domain used by Exchange to sign on to MultiSendcon.

February 18, 2013

  • Improved: Can now deliver to domains without MX records in DNS by substituting the domain name directly for the missing MX entry. Not quite correct but works fine for the surprisingly high numbers of hosts that have missing MX records.

January 29, 2013

  • Improved: Longer SMTP timeout for sites that deliberately delay SMTP answers to deter spammers. We encountered a few sites that delay "RCPT TO" command answers for up to 40 seconds so MultiSendcon now waits up to 90 sec for SMTP protocol answers to enable successful transmission to these sites as well.

January 23, 2013

  • Bugfix: Communication problems between Admin and MultiSendcon service due to IP port conflicts solved.
  • Improved: Admin log window let's you now copy text and scroll without stopping updates.

January 21, 2013

  • Improved: Support for finding active mail server for hosts with multiple MX entries (only necessary when sending directly / dns)
  • Improved: Moved communication between Admin and Service to IP port 7890 to avoid crowded port 8000.

January 17, 2013

  • Bugfix: Timing issue could cause buildup of addresses in SMTP sessions with many emails - solved.

January 16, 2013

  • Extended support for repeat transmission in case outgoing email gets rejected to more SMTP error codes because not all sites use the correct "temporary fail" codes 45x

January 15, 2013

  • New: Support for repeat transmission in case outgoing email gets rejected by greylisting sites with SMTP error code 45x
  • New: Passwords no longer displayed as clear text in configuration (several customers asked for this)

January 12, 2013

  • This is the first public release.

September 04, 2012

  • Pre-production version, never released outside development team.