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From: Claus =?iso-8859-1?Q?A=DFmann?= <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org>
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Subject: Re: Question: should submit.mc include nocanonify by default?
Date: Wed, 18 Jun 2025 01:42:35 -0400 (EDT)
Organization: MGT Consulting
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Originator: ca@x2.esmtp.org (Claus Assmann)

Stacey Marshall  wrote:

> I was a little surprised to see SMTP client queue (sendmail -Ac) trying 
> to look up DNS names as I thought it only collected mail for local 
> accounts.

What gave you that impression?
It's the "MSP": mail submission program - all local mail submissions
use it unless they use SMTP directly.
Hence that program (sendmail with the submit.cf file) makes all the
changes required for mail submission, e.g, add missing headers and
fix incomplete addresses - which means it should "canonify" addresses
so the MTA doesn't have to do it.

See sendmail/SECURITY.

-- 
Note: please read the netiquette before posting. I will almost never
reply to top-postings which include a full copy of the previous
article(s) at the end because it's annoying, shows that the poster
is too lazy to trim his article, and it's wasting the time of all readers.