Zimbra: Securing distribution list.

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November 12, 2018 by aubreykloppers

Over the last week I had an external email that was sent to my internal Zimbra distribution list.  To secure I did the following:

  • zmprov modifyConfig zimbraMilterServerEnabled TRUE
  • zmprov grr dl {distribution-list}@my.domain dom my.domain sendToDistList
  • zmmtactl reload

What this does is:

  1. Enable the Milter service.
  2. Restrict mail to the distribution list only from {my.domain}
  3. Applied the ACL.

Sending mail to the distribution list then gives you the following returned error:

The response from the remote server was:

550 rejected because recipient verify failed – user not found

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