Search Engine: Elastic

Article ID: 121290, created on Apr 23, 2014, last review on May 9, 2014

  • Applies to:
  • Plesk Automation 11.1


An attempt to send mail message to yahoo servers fails.

The following error can be observed in the /usr/local/psa/var/log/maillog:

Jan 22 12:09:40 mail postfix/error[24864]: E0A7610C004: to=, relay=none, delay=155944, delays=155944/0.02/0/0.02, dsn=4.7.1, status=deferred (delivery temporarily suspended: host[] refused to talk to me: 421 4.7.1 [TS03] All messages from X.X.X.X will be permanently deferred; Retrying will NOT succeed. See


Yahoo blocked IP address.

According to the Yahoo knowledge base article the "421 4.7.1 [TS03] All messages from X.X.X.X will be permanently deferred" message indicates Yahoo is seeing a high volume of emails from your IP address, which is a characteristic of unsolicited, bulk emailing.


Contact Yahoo support to unblock IP address.

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