Hey friends,
I just noticed that on November 22nd, Google started returning new
errors:
421-4.7.28 Gmail has detected an unusual rate of unsolicited mail
originating from your SPF domain [userdomain.tld 15]. To protect our
users from spam, mail sent from your domain has been temporarily rate
limited. For more information, go to
https://support.google.com/mail/?p=UnsolicitedRateLimitError to review
our Bulk Email Senders Guidelines.
o13-20020a056870200d00b002033c710f0asi2122725oab.109 - gsmtp
And a little of this:
421-4.7.28 Gmail has detected an unusual rate of unsolicited mail
originating from your DKIM domain [ 15]. To protect our users from spam,
mail sent from your domain has been temporarily rate limited. Please
visit https://support.google.com/mail/?p=UnsolicitedRateLimitError to
review our Bulk Email Senders Guidelines.
y5-20020a056808130500b003b3eaa2eb4esi890433oiv.53 - gsmtp
And of course, the more generic:
421-4.7.28 Gmail has detected an unusual rate of unsolicited mail. To
protect our users from spam, mail has been temporarily rate limited.
Please visit
https://support.google.com/mail/?p=UnsolicitedRateLimitError to review
our Bulk Email Senders Guidelines.
i1-20020a9d68c1000000b006d47c518673si38890oto.150 - gsmtp
It seems like Google is no longer just rate limiting IP addresses for
this, but getting down into finer detail when rate limiting. Perhaps it
was always there and the messaging has just been clarified. Either way,
a welcome change, and good news for anyone who didn't know about it.
Obligatory: We don't intend to send any email their way that could be
perceived as unsolicited, but our users do use forwarders and we'll
never completely match their filters.
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