On Wednesday, October 24, 2001, at 11:57 AM, Nick Simicich wrote:
At 06:04 AM 2001-10-23 -0400, Tom Neff wrote:
You can also add authenticated ESMTP on a higher port that lame-o ISP's
don't know to stop, e.g.
O DaemonPortOptions=Port=9925, Name=MSA, M=E
in your sendmail.cf. I find this very useful in the field.
The "submissions" port, port 587, seems to be the right port for this -
it is designed for an smtp like interchange which is an "initial
submission" of mail to a smtp server from what is ostensibly an end
user (MUA) using smtp for mail injection, rather than MTA to MTA
transmission of mail.
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).
Selecting a random high-numbered port seems like a better idea.
Now if only the popular (non-open-source) mail clients would let you
specify the outgoing SMTP destination port...
Michael C. Berch
com / mcb @