Too Many Recipients error (452) (MDaemon 9.x and below)

My users get a '452 - too many recipients' error when sending to more than 100 users. 

By default, MDaemon sets a limit of 100 recipients per message received via SMTP. This is what the RFC (Internet standards) suggest.

If you would like to change this setting:

  1. Open the Setup menu
  2. Click on Miscellaneous Options
  3. Select the Servers tab
  4. Edit the value under the 'Allow this many RCPT commands per message' field
  5. Click Apply and OK