Mail delivery failed: returning message to sender

Mail Delivery System <[email protected]> Sun, 03 Apr 2022 07:08:11 +0300
Newsgroups gmane.mail.imap.offlineimap.general
Message-ID <[email protected]>
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  [email protected]
    host gmail-smtp-in.l.google.com [173.194.220.27]
    SMTP error from remote mail server after pipelined end of data:
    550-5.7.1 [89.184.91.223      18] Our system has detected that this message is
    550-5.7.1 likely suspicious due to the very low reputation of the sending IP
    550-5.7.1 address. To best protect our users from spam, the message has been
    550-5.7.1 blocked. Please visit
    550 5.7.1  https://support.google.com/mail/answer/188131 for more information. r15-20020a2eb60f000000b0024952f7bbf2si5204553ljn.333 - gsmtp

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OfflineIMAP homepages:
- https://github.com/OfflineIMAP
- http://offlineimap.org
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