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The drama is about notice so I did a quick search of SMTP server software marketshare (number of servers, not users). Postfix apparently runs 37% of them.

https://www.securityspace.com/s_survey/data/man.202311/mxsur...

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I'm finding it interesting that Exim isn't mentioned once in the article or here, even though it's marketshare is much higher than Postfix's at 55%. Would be nice to have confirmation that Exim isn't affected at least.

Exim is partially affected [0], though not in a readily exploitable way, as far as I understand.

[0] https://bugs.exim.org/show_bug.cgi?id=3063

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