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I've come to the realization that if you run a compliant mail server (with DKIM, DMARC and SPF) then you become a target for brute-force password attacks because those Spammers do like their mail to be delivered reliably.
This seems to work in practice. I've noticed a lot of Spam, incoming, which passes all those checks and it only gets sent to my Junk folder due to the excellent efforts of Bogofilter.
If you run a mail server, make sure it'll stand up to these attacks.
@neildarlow If you want to see "attack fun", put a QNAP on your network and enable HTTP. Thirty seconds, and the whole world will be trying to log in. 