Add Email Subject: [EXTERNAL] to all incoming emails

OS type and version Rocky Linux 9.2
Webmin version 2.021
Virtualmin version 7.7
Related packages Postfix 3.5.9 PHP 8.1.14 Python 3.9.16

Recently I’ve been asked to add a text to all incoming email: [EXTERNAL] and just googling found three alternatives:

  • MIMEDefang

  • pymilter

  • purepythonmilter

Which one may be better to work with Virtualmin or can Postfix directly do it?

Postfix can rewrite headers, including subject. email - Postfix Change subject based on recipient - Server Fault

Procmail (which is the mail delivery agent in Virtualmin systems) can also do it. procmail - procmailrc - change email subject - Server Fault

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