Yes, it was mentioned to powers that be over there that the error
message is NOT very clear, and doesn't accurately represent the problem.
Basically, once they find a reason to be more 'suspicious' of the
messages that are being sent (And don't ask me about their black magic
to decide that, but often it can be new IP(s) or rate limiting, etc..)
they want you to provide some 'authorization' (not authentication in the
SMTP AUTH sense).
This means, often as little as adding an SPF record for the domain.
Or a DKIM.. or ..
-- Michael --
On 2019-04-22 8:31 a.m., John Leslie wrote:
I got a surprise trying to confirm a dental appointment
status=SOFTBOUNCE (host alt2.aspmx.l.google.com[172.217.192.26] said: 550-5.7.1
This message does not have authentication information or fails to pass
550-5.7.1 authentication checks. To best protect our users from spam, the
550-5.7.1 message has been blocked.
Obviously, I have reverted to telephonic reply...
But this seems like something worth understanding; and this list seems
an excellent place to find someone who understands what google is doing.
Anyone volunteer to give me a pointer?
--
John Leslie <j...@jlc.net>
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