> > The "submissions" port, port 587, seems to be the right port for this -
> The problem with this is that if it becomes widely used and known, ISPs
> will probably block that port, too, without thinking about it too much
> (and not realizing that it is not really much of a spam threat).
Port 587 is only supposed to be open to authenticated users via
pop-before-send or SMTP AUTH or the like. Just leaving it open is a
dreadful idea. If you're going to set up an open relay, I agree that you
should hide it on a random port, but it'd be better not to do it at all.
John Levine, johnl @
com, Primary Perpetrator of "The Internet for Dummies",
Information Superhighwayman wanna-be, http://iecc.com/johnl, Sewer Commissioner
Finger for PGP key, f'print = 3A 5B D0 3F D9 A0 6A A4 2D AC 1E 9E A6 36 A3 47