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How to configure and/or bypass SMTP maximum message size restrictions

MDaemon has the ability to configure a maximum message size globally and/or per-domain.  The steps below will detail how to exclude authenticated SMTP sessions from the maximum message size restriction. 

To configure a maximum message size for all users/senders and enable the SMTP AUTH sessions to bypass this value:

  1. Select Setup
  2. Select Server Settings
  3. Select Servers
  4. Enter a KB value in the Refuse messages larger than text box.
  5. Check ...except when SMTP AUTH is successfully used
  6. Click Apply
  7. Click OK 

MDaemon's Domain Manager can configure maximum message sizes for authenticated domain senders and a maximum message size from other senders.

  1. Select Setup
  2. Select Domain Manager
  3. Expand the menu (+) of the domain to be configured.
  4. Select Settings
  5. Enter a KB value in the Max message size from authenticated senders box.
  6. Enter a KB value in the Max message size from all other senders box.
  7. Click Apply
  8. Click OK