Change the Maximum Message Size in Mailman


Learn how to change the maximum message size allowed in Mailman.


Critical Concepts

Mailman can place a limit on the size of a message that it accepts for list postings. The owner can change the limit to try to restrict or allow attachments to be sent to the list.


Steps to Take

To change the maximum message size limit:

  1. Log in to the list's administration page: with your Active Directory username and password (replace ListName with the actual name of your list. The final character is a lowercase letter 'L' for 'list.')
  2. Go to General Options.
  3. Locate Maximum length in Kb of a message body (near the bottom).
  4. Change the limit to something suitable, or enter 0 for the maximum server limit of 10 MB.
  5. Submit your changes.

Note: If you have a message that is larger than 10 MB, you will not be able to send it to your list. You can:

If you still have questions or need additional assistance, please submit a ticket or call the ITS Service Desk at (858) 246-4357