Viktor,
It did not show back-to-back delivery of two separate messages.
Rather it showed a single message that tried two MX hosts in
succession, because the first MX host returned a 4XX response.
Is there a way for me to instruct postfix not to attempt delivery to second MX host, if first attempt failed?
According to the Google Apps support, it's exactly what causes the temporarily ban.
The reported error was an excess arrival rate of mail into a single
user's mailbox, (joe-job, too many bounces for mail from that user,
...). It was not a violation of a rate limit from your IP address
to Gmail.
Well, google says otherwise. They say, there was two attempts to connect within the second, and they're banning me for that.
Thank you,
-sashk
