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How can I configure my mailing list so that anyone with a Sussex account can post to it?

This article describes how you can configure your Sussex mailing list so that it will accept email from anyone with a email address, if they are not already a member of the mailing list.

  1. Open your list's admin web page (, where listname is the name of your mailing list).
  2. After having gained entry, click the Privacy Options link.
  3. Click the Sender Filters link.
  4. Scroll down to the option box labelled "List of non-member addresses whose postings should be automatically accepted."
  5. Enter the following one-line expression, exactly as shown, into the box:


    You might like to copy this expression from this FAQ, and paste it into the Mailman option box, to ensure an exact copy.  The expression means "any address ending with")

  6. Click the 'Submit Your Changes' button button to put this change into effect.
  7. Click the Logout link to close your admin page.

The expression given in step 5 is an example of what is called a regular expression: you can learn more about regular expressions in Wikipedia.

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This is question number 1558, which appears in the following categories:

Created by Andy Clews on 6 May 2009 and last updated by Richard Byrom-Colburn on 29 September 2016