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Re: Question: should submit.mc include nocanonify by default?

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Marco Moock <mm@dorfdsl.de> wrote:
> On 12.05.2025 18:10 Uhr Stacey Marshall wrote:
>
>> Question, should submit.mc include nocanonify by default?
>> 
>> 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.  In the configuration in question the Mail Transfer
>> Agent (sendmail -bl) is configured to forward all mail to a gateway
>> machine for actual delivery, and only that gateway machine has access
>> to DNS.
>
> Most machines that handle mail have access to DNS nowadays. If your's
> doesn't, disable such lookups.
>
>> Thus I was wondering if submit.mc should include the nocanonify
>> feature by default?
>
> I do not see a reason for that as most machines have access to DNS. A
> default setting is something that fits general situations and not
> corner cases.
>
> Most servers also check the recipient domains and reject stuff that
> isn't an FQDN or unresolvable, so the default checks are sane.

As I understand submit.mc is supposed to be "one size fits *ALL* ".
IMHO Your argument makes very good sense only if submit.mc is supposed
to be modified not only in super rare cases.

-- 
[Andrew] Andrzej A. Filip

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Thread

Question: should submit.mc include nocanonify by default? Stacey Marshall <stacey.marshall@gmail.com> - 2025-05-12 18:10 +0100
  Re: Question: should submit.mc include nocanonify by default? Marco Moock <mm@dorfdsl.de> - 2025-05-13 21:28 +0200
    Re: Question: should submit.mc include nocanonify by default? Stacey Marshall <stacey.marshall@gmail.com> - 2025-05-14 17:54 +0100
    Re: Question: should submit.mc include nocanonify by default? Andrzej Adam Filip <anfi@onet.eu> - 2025-05-14 20:27 +0200
      Re: Question: should submit.mc include nocanonify by default? Stacey Marshall <stacey.marshall@gmail.com> - 2025-06-17 14:00 +0100
  Re: Question: should submit.mc include nocanonify by default? Marco Moock <mm@dorfdsl.de> - 2025-06-17 21:19 +0200
  Re: Question: should submit.mc include nocanonify by default? Claus Aßmann <INVALID_NO_CC_REMOVE_IF_YOU_DO_NOT_POST_ml+sendmail(-no-copies-please)@esmtp.org> - 2025-06-18 01:42 -0400
    Re: Question: should submit.mc include nocanonify by default? Stacey Marshall <stacey.marshall@gmail.com> - 2025-06-23 13:46 +0100

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