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Re: [ietf-smtp] test for port 25 of sending MTA - for spam detection

2013-08-23 09:36:25
Have we already forgotten the craze for this kind of thing a few years
ago?  Here's an illustrative blog post I pulled up with a quick search
on "smtp callback":

AOL was in fact doing "call back to port 25 on the sending IP" for a
while, I still have a rack of mail servers that ought to be outbound
only but which are EHLOing (and then rejecting everything) on port 25
because of this foolishness.
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