On Wed, May 29, 2024 at 2:52 PM Wietse Venema via Postfix-users
<postfix-users@postfix.org> wrote:

> Presumably you have to DKIM or SPF or DMARC for hostname.raystedman.org,
> so any way to get double-bou...@raystedman.org should help.
>
> You have to be careful about mailer loops, though.
>
> Postfix gives special treatment to <> and <double-bounce@$mynostname>
> to avoid an infinite loop of notifications for failed notifications.

Please note mail01 receives email from our private network Only.  This
email is created by our servers.
mail01 does not receive email from the Internet. All of our MX records
point to Google.
If we can get the double-bounce to Google, there seems to be little
chance of a mailer loop.

We have two DMARC/DKIM/SPF setups:
  (1) email with domain raystedman.org is relayed through Google.
This is our transactional email (subscription double opt-in and the
like).
  (2) email with domain devotion.raystedman.org is sent directly onto
the Internet.

I am reluctant to create a third DMARC/DKIM/SPF for the double-bounce
case which is now using domain mail01.raystedman.org.

I created a SPF record for mail01.raystedman.org -- for tonight.  This
should be enough to get DMARC to pass when the double-bounce email is
received by Google -- at least this is the hope.  I will work on this
again Thursday.

Thanks, Greg
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