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Serge, that's a misleading line of
reasoning.
Here's the thing:
Auth on port 587 is the right best practice for ISPs (and
some corporations) so that they can properly secure their MTA against misuse by
3rd parties, including worms on their client subnets.
It cuts off large swaths of current flaws: the ISP won't
have any open relays, won't have whitelisted client subnets, thereby allowing
the ISP to firewall outbound port 25 from their personal clients. Auth on
587 also allows the client to wander all over the Internet with their laptop and
still send mail with their own mailfrom name from the expected ISP's
MTA.
As you've surmised, this doesn't help if the bad guys have
auth that they've stolen from one of your clients.
However, this becomes the same case as if the bad guy is
one one of your clients, and the answers are the same; the ISP needs traffic
logging and alerts, e.g. the mail volume restrictions over time that were
discussed earlier today.
Is that clearer?
Andrew 8)
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