From owner-freebsd-security  Tue Feb 13  8:13:59 2001
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Date: Tue, 13 Feb 2001 11:13:49 -0500 (EST)
From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
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To: Ragnar Beer <rbeer@uni-goettingen.de>
Cc: freebsd-security@FreeBSD.ORG
Subject: port 587 - submission
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<<On Tue, 13 Feb 2001 17:08:24 +0100, Ragnar Beer <rbeer@uni-goettingen.de> said:

> Howdy!

Hi.  Please, in the future, remember to press `return' at the end of
each (72-character-or-less) line of text in your e-mail.  I have
reformatted your original text for clarity.

> In the process of closing all the open ports that I really don't
> need I found a port 587 listed as service 'submission' by nmap. Does
> anyone know what kind of service that is?

Yes, it is the mail submission agent which is implemented by
sendmail.  Its purpose is to allow network mail client programs to
submit their mail and receive the appropriate processing (e.g.,
inserting Message-ID and Date headers) which is not permitted in SMTP.

-GAWollman



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