Path: ...!news.misty.com!.POSTED.veps.esmtp.org!not-for-mail
From: Claus =?iso-8859-1?Q?A=DFmann?= <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org>
Newsgroups: comp.mail.sendmail
Subject: Re: strange host lookups
Date: Thu, 3 Oct 2024 07:10:31 -0400 (EDT)
Organization: MGT Consulting
Sender: <ml+sendmail(-no-copies-please)@esmtp.org>
Message-ID: <vdlu37$ogl$1@news.misty.com>
References: <vdlmii$3kha3$1@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
Injection-Date: Thu, 3 Oct 2024 11:10:31 -0000 (UTC)
Injection-Info: news.misty.com; posting-host="veps.esmtp.org:155.138.203.148";
	logging-data="25109"; mail-complaints-to="abuse@misty.com"
Mail-Copies-To: never
X-Newsreader: trn 4.0-test77 (Sep 1, 2010)
Originator: ca@x2.esmtp.org (Claus Assmann)
Bytes: 2167
Lines: 31

Marco Moock  wrote:

> The question is just why sendmail resolves that name, as it isn't an
> SMTP recipient of the current mail nor a sender or hostname etc.

> It is only part of the Reply-To header of the mail (to test if the

Addresses in headers might be rewritten (or need to be "fixed").

See for example sendmail/TUNING (and cf/README)

* DNS Lookups
-----------------------------------------------

sendmail performs by default host name canonifications by using
host name lookups.  This process is meant to replace unqualified
host name with qualified host names, and CNAMEs with the non-aliased
name.  However, these lookups can take a while for large address
lists, e.g., mailing lists.  If you can assure by other means that
host names are canonical, you should use

		FEATURE(`nocanonify', `canonify_hosts')

in your .mc file.  For further information on this feature and
additional options see cf/README.
[[... read on ... ]]

-- 
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.