Jaroslaw Rafa via Postfix-users:
> Dnia 22.08.2023 o godz. 15:41:43 Alex via Postfix-users pisze:
> > This mail server unfortunately has quite a few users who use ~/.forward to
> > forward mail through to their personal gmail account from their corporate
> > account.
> >
> > Aug 22 15:33:08 cipher postfix-gmail/smtp[2551987]: 5EF9820E0E1E8: host
> > gmail-smtp-in.l.google.com[64.233.176.27] said: 421-4.7.28 [209.216.111.60
> > 15] Our system has detected an unusual rate of 421-4.7.28 unsolicited
> > mail originating from your IP address. To protect our 421-4.7.28 users from
> > spam, mail sent from your IP address has been temporarily 421-4.7.28 rate
> > limited. Please visit 421-4.7.28
> > https://support.google.com/mail/?p=UnsolicitedRateLimitError to 421 4.7.28
> > review our Bulk Email Senders Guidelines. 185-
>
> I would not trust too much error messages from Google, and there is a
> possibility you cannot do anything at all.
>
> It happened once to me that I ran - "out of the blue", for unknown reason -
> into getting exactly the same reject message from Google while sending 4-5
> messages IN TOTAL PER DAY to Google. Eventually, after 10-12 hours, the
> messages got through, but then the same happened again with any (even a
> single) message my server sent to Gmail.
Unfortunatey, the Postfix schedulerisn't smart enough to figure out
that a domain is hosted at google. Even if the doain is not google,
it may be hosted there and add to your rate limit. I'm not claiming
that gmail is perfecr, but neither is Postfix.
Wietse
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