I was given the following error from a customer:

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  [email protected]
    (generated from [email protected])
    SMTP error from remote mail server after end of data:
    host kendy.up.ac.za [137.215.101.101]: 554 5.7.1 failed SPF:
    Please see
http://www.openspf.org/why.html?sender=hnorthall%
40gmail.com&ip=160.124.208.1&receiver=spamcontrol.up.ac.za


Basically, hnothall@gmail is sending mail to [email protected] (which
I host) which has a simple Forwarder to send e-mail to five other
addresses, including [email protected]

From following the above links, I get the impression that I need to
compile SRS in with Exim?
Is there anything else I need to do? Change to exim.conf?
Find a different rabbit hole to jump into?

I run Gentoo with Exim-4.84.

I have been experimenting with SFP, DKIM and DMARC stuff - but have so
far not touched the machine that is involved above (160.124.208.1).

I'd love to see an example exim.conf that included all of the new magic.

-- 
Mark James ELKINS  -  Posix Systems - (South) Africa
[email protected]       Tel: +27.128070590  Cell: +27.826010496
For fast, reliable, low cost Internet in ZA: https://ftth.posix.co.za

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