Fourhundred Thecat via Postfix-users:
> > On 2023-04-12 14:48, Byung-Hee HWANG via Postfix-users wrote:
> >> 2) change smtp_helo_name to
> >>
> >> smtp_helo_name = $mydomain
> >
> > It is very strange, i think.
>
> what do you mean?
> is it strange to use example.com, instead of mail.example.com as
> smtp_helo_name, when the smtp client is actually mail.example.com ?
The smtp_helo_name used in the Postfix SMTP client should resolve to the
client IP address that is seen by a remote SMTP server.
Thus, setting smtp_helo_name=$mydomain may appear to work when your
domain has only one machine that sends email, but it does not work
well when there are multiple machines.
Wietse
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