I'm testing our emails with Mail-Tester.com and it's showing that when sending individual email messages to Contacts, the emails are missing a "Message-Id: header".

How can I change this? It doesn't appear to happen when sending bulk email, just individual emails.

1 Answer 1


Under administer - civimail - civimail component settings there is an option for "Enable CiviMail to generate Message-ID header"

  • thanks - it worked! Commented Nov 18, 2021 at 0:10

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