Blocking (or throttling) port 25 only guarantees that SMTP servers
will start accepting mail on other, non-blocked, non-compromised
ports.
Please explain why I would want my mail swerver to accept mail on
other ports, given that it's almost certainly spam
If you have so few roaming users wanting to send mail through you via
SMTP that mail to that port is "almost certainly spam", then you
probably don't want to do that.
But places with a lot of roaming users, especially the sort of
semi-geek often called a "power user", quite probably do, because the
resulting mail *isn't* "almost certainly spam".
Presumably such things will be using SMTP AUTH or better to secure the
connections; if they don't, yes, they will promptly become spam
conduits and get shunned in consequence.
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