- Plesk for Linux
Unable to send an email from Plesk server to
@gmail.commailbox, due to the following error in
CONFIG_TEXT: postfix/qmgr: 9BAC3FDD6B: 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
Unable to send an email from Plesk server to a
@hotmail.demailbox, due to the following error in
CONFIG_TEXT: qmail: 1524715120.095054 delivery 124: failure: Connected_to_2001:db8:f61:a1ff:0:0:0:80_but_sender_was_rejected. Remote_host_said:_550_5.7.1_Unfortunately,messages_from[203.0.113.2]_werent_sent.Please_contact_your_Internet_service_provider_since_part_of_their_network_is_on_our_block_list(S3150)._You_can_also_refer_your_provider_to_http://mail.live.com/mail/troubleshooting.aspx#errors.
and the next bounce message can be gotten:
CONFIG_TEXT: Connected to 2001:db8:f61:a1ff:0:0:0:80 but sender was rejected.
Remote host said: 550 5.7.1 Unfortunately, messages from [203.0.113.2] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.
Checking server IP address in any public Blacklist checker, e.g. Mxtoolbox, shows that the server IP is blacklisted.
Server IP is blacklisted as spamming.
Identify the source of spam and block it:
When source of spam is found and stopped, contact the blacklist support in order to exclude server IP from their blacklist.