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korlja | 3 years ago

in postfix.conf, set header_checks = pcre:/etc/postfix/header_checks and in /etc/postfix/header_checks add:

/In-Reply-To:.*msgid-2948573294867@example.com/ REJECT reply-storm

However, blocking the whole thread that will originate is not as easy.

discuss

order

bo1024|3 years ago

That msgid should be at the top of the “references” header in all thread replies, right?

korlja|3 years ago

Should be, but I'm not so sure about Outlook, which is usually involved in all such reply-all-storms. Replies and threads in Outlook are very weird.