Fourhundred Thecat via Postfix-users:
> > On 2023-04-12 15:30, Wietse Venema via Postfix-users wrote:
> > Fourhundred Thecat via Postfix-users:
> >> > On 2023-04-12 14:48, Byung-Hee HWANG via Postfix-users wrote:
> >
> > 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.
>
> OK, I see.
> So should the client (mail.example.com) then have it's own SPF record,
> in addition to the domain itself (example.com) ?
Yes, if you must use SPF. In that case you may also want to "close
a loophole", by configuring one SPF record for every name in the
domain that does NOT send email. Otherwise those names would not
be "protected" with SPF (would evaluate to "neutral").
Wietse
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