[Mimedefang] OS wars... [was Viruses: Bounce or Discard?]
Kevin A. McGrail
kmcgrail at pccc.com
Tue Sep 30 11:40:00 EDT 2003
> Better yet, use port 587 -- the generally recognized submission port
Sure, we just decided on 2025 like 4 years ago or more prior to the
submission queue standard. Though I would bet ISPs will block 587 too.
ISPs around here are even blocking 110, 143, etc. It's getting ridiculous.
The more non-standard your choice, the better and especially choosing a
non-standard, "unprivileged" port has it's benefits. One of the
non-standard "standards" I've seen creeping up is 2525. ;-)
> - -- and protect it with the requirements that you must authenticate
> before submitting anything and (preferably) you must use TLS. You can
> get away with running an extremely tight ship on an alternate port
> like 587, because you're not expecting random MTAs to contact you and
> attempt to deliver mail there, you're only expecting registered users
> to do so.
I am assuming they have anti-relay techniques whatever they might be. We
use SSL and POP/IMAP auth before SMTP.
Regards,
KAM
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