Path: ...!news.misty.com!.POSTED.veps.esmtp.org!not-for-mail From: Claus =?iso-8859-1?Q?A=DFmann?= Newsgroups: comp.mail.sendmail Subject: Re: strange host lookups Date: Thu, 3 Oct 2024 07:10:31 -0400 (EDT) Organization: MGT Consulting Sender: Message-ID: References: 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.