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'550 5.7.1 Command Not Allowed' When Greylisting Blocks All Emails

Author: Luis Fernandes

Overview

All emails get rejected with a permanent 550 error on Simple Mail Transfer Protocol (SMTP) level when Greylisting is enabled in MailEssentials. The error message should be similar to the following:

550 5.7.1 Command not allowed

Environment

  • GFI MailEssentials
  • All supported environments

Root Cause

There is an invalid value in the actionflag field.

Resolution

  1. Stop all MailEssentials services (disable both Scan Services so they do not get restarted).
  2. Make a backup copy and open the config.mdb found in  ..\GFI\MailEssentials\AntiSpam\ with MS Access.
  3. Open the table Actions.
  4. Locate the line with the stringid greylisting and change the value in the actionflag field to 4096.
  5. Close the database and restart the MailEssentials services.

 

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