gmail.com started failing messages from domains which are correctly setup
for SPF (and have been for some years):
550-5.7.26 Gmail requires all senders to authenticate with
either SPF or DKIM. 550-5.7.26 550-5.7.26 Authentication results:
550-5.7.26 DKIM = did not pass 550-5.7.26 SPF [nagler.me] with ip:
[139.177.203.52] = did not pass 550-5.7.26 550-5.7.26
$ dig +short txt nagler.me
"v=spf1 a mx ip4:139.177.203.52 include:_spf.google.com -all"
Sending to (paid) Google Workspace domains works fine. Nothing has changed
on our end, and failures only started this morning.
Any ideas?
Thanks,
Rob
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