Mail cannot be sent to @gmail.com: IP address has been temporarily 421-4.7.0 rate limited

Created:

2017-06-08 16:36:23 UTC

Modified:

2017-08-08 13:22:07 UTC

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Mail cannot be sent to @gmail.com: IP address has been temporarily 421-4.7.0 rate limited

Symptoms

Unable to send an email to @gmail.com:

postfix/qmgr[737]: 9BAC3FDD6B: from=<1@example.com>, size=112903, nrcpt=1 (queue active)

postfix/smtp[30559]: 9BAC3FDD6B: host ASPMX.L.GOOGLE.COM[203.0.113.2] said: 421-4.7.0 Our system has detected an unusual rate of 421-4.7.0 unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit 421-4.7.0 https://support.google.com/mail/?p=UnsolicitedRateLimitError to 421 4.7.0 review our Bulk Email Senders Guidelines. 91si5730706wrs.75 - gsmtp (in reply to end of DATA command)
postfix/smtp[30559]: connect to ASPMX.L.GOOGLE.COM[2a00:1450:400c:c02::1b]:25: Network is unreachable

Cause

Server IP is blacklisted as spamming

Resolution

Identify the source of spam and block it.

Visit Plesk Administrator Guide for recommendations that will help to prevent spam. If there is a malicious script sending spam from your server, you can detect it according to instructions below:

Many email messages are sent from PHP scripts on a server. How to find domains on which these scripts are running if Postfix is used?

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