The "[]" in that error is where the sender domain lives. It's blank,
which means your sender is blank. So I assume these are either delivery
failures that you are sending to Gmail, or your email lacks a sender
address for some other reason (hardly uncommon from my customers at
least).
I've been told that having an SPF record on the hostname of the server
sending the bounce message is helpful, but testing that is super low on
my priority list right now. If it isn't helpful, then I would just
assume Google doesn't want bounce messages.
On 2026-01-24 06:11, Thomas Walter via mailop wrote:
Hello Ops,
gmail bounces some of our messages because of SPF not passing:
550-5.7.26 Your email has been blocked because the sender is
unauthenticated.
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 [] with ip: [185.149.214.63] = did not pass
550-5.7.26 550-5.7.26 For instructions on setting up authentication,
go to
550 5.7.26 https://support.google.com/mail/answer/81126#authentication
5b1f17b1804b1-4804d8ba409si18736685e9.65 - gsmtp (in reply to end of
DATA command))
But our SPF records are just fine for that IP?
https://mxtoolbox.com/SuperTool.aspx?action=spf%3afh-muenster.de%3a185.149.214.63&run=toolpage
We are also no mass sender exceeding 5000 mails per day, so we should
be
fine with SPF only.
Any hints on what to check?
Regards,
Thomas Walter
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