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Subject: Re: Automated bounce recognition
From: "Michael C.Berch" <mcb @ postmodern . com>
Date: Thu, 25 Oct 2001 13:50:53 -0700
To: list-managers @ greatcircle . com
In-reply-to: <5 . 1 . 0 . 14 . 2 . 20011024145452 . 046d2580 @ 127 . 0 . 0 . 1>

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
mcb @
postmodern .
com / mcb @
greatcircle .
com




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