Doveadm fetch slow and 100%CPU with a specific message-id

[Joseph Tam]

On Mon, 25 Oct 2021, Ron Garret wrote:

> Note that message-ids are not guaranteed to be unique.  During my test
> I found groups of as many as 20 different messages with the same
> message ID.  (Turns out this makes quite a reliable spam signal!)

It's by far not a rare situation: duplicate message-ids happen whenever
the sender names more than one local recipient during SMTP.  It's a wholly
unreliable way to indicates spaminess.  However, if a high proportion
of those recipients do not exist, ...

Joseph Tam <jtam.home at gmail.com>