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Only messages less than 10MB in size seem to come through, does POPcon impose a size limit?

No, POPcon works fine with emails larger than 100MB but Exchange is normally set up to not accept Emails larger than a certain size. Unfortunately there are three different settings you need to check:

  1. In the Exchange System Manager > Server > YOURSERVER > Protocols > SMTP > Properties of the Virtual Defaultserver for SMTP.

    Message size limit on the Exchange Properties of the Virtual Defaultserver for SMTP


  2. In the Exchange System Manager > Global Settings > Properties of Message Delivery > Defaults.

    Message size limit on the Exchange Message Delivery Properties


  3. In the Active Directory entry of the individual user > Exchange General tab > Delivery Restrictions.

    Message size limit on the Active Directory user delivery restrictions