- Plesk for Linux
- Plesk for Windows
Unable to send an email from Plesk server to @gmail.com, @hotmail.com, @outlook.com, @yahoo.com or any Microsoft-hosted mailbox, due to the following error in
CONFIG_TEXT: postfix/qmgr: 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
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.
CONFIG_TEXT: Remote Server returned '554 5.7.1 <outlook-com.olc.protection.outlook.com #5.7.1 smtp; 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 (S3140). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.
CONFIG_TEXT: postfix/smtp: 9AEA08CB9D: host mta6.am0.yahoodns.net[203.0.113.2] said: 421 4.7.0 [TSS04] Messages from 203.0.113.2 temporarily deferred due to user complaints - 203.0.113.3; see https://help.yahoo.com/kb/postmaster/SLN3434.
CONFIG_TEXT: [203.0.113.2] The IP you're using to send mail is not authorized to 550-5.7.1 send email directly to our servers. Please use the SMTP relay at your 550-5.7.1 service provider instead. Learn more at 550 5.7.1 https://support.google.com/mail/?p=NotAuthorizedError h1si7104782plt.44 - gsmtp (in reply to end of DATA command))
CONFIG_TEXT: status=bounced (host example-com.mail.protection.outlook.com[188.8.131.52] said: 550 5.7.606 Access denied, banned sending IP [203.0.113.2]. To request removal from this list please visit https://sender.office.com/ and follow the directions. For more information please go to http://go.microsoft.com/fwlink/?LinkID=526655 (AS16012609) (in reply to RCPT TO command))
The same bounce back message may be sent to the sender informing about not successful delivery.
- When checking a server IP address using the MXToolbox blacklist checker, it shows that the IP address is in one of the DNS-based email blacklists (Commonly called Realtime blacklist, DNSBL or RBL).
Server IP is blacklisted on recipient side due to spamming.
Identify the source of spam and block it. The following link may be useful:
When the source of spam is found and stopped, contact the blacklist support in order to exclude the server IP from blacklist: