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

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.


--
kind regards
Marco

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