- Plesk for Linux
Unable to send an email from Plesk server to @gmail.com, the following error is found in
/var/log/maillog on a Plesk server:
CONFIG_TEXT: postfix/qmgr: 9BAC3FDD6B: from=<firstname.lastname@example.org>, size=112903, nrcpt=1 (queue active)
postfix/smtp: 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: connect to ASPMX.L.GOOGLE.COM[2a00:1450:400c:c02::1b]:25: Network is unreachable
Checking Plesk server IP with any public Blacklist check, for example, with Mxtoolbox, shows that the IP is blacklisted.
Server IP is blacklisted as spamming.
- Identify the source of spam and block it:
Plesk Administrator Guide
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?
- When spamming is stopped, contact the blacklist support in order to exclude server IP from the blacklist