Hello everyone, As a mailing list administrator, I am facing a challenge that has pushed me to my /etc. I manage a mail server which handles emails for users accounts and public mailing lists. One of my mailing lists is subject to a special problem: The first post would get delivered to all list subscribers. Subsequent responses to that post would fail to get delivered to almost ALL the subscribers with gmail servers saying: ``` A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:
[email protected] host alt1.gmail-smtp-in.l.google.com [192.178.213.26] SMTP error from remote mail server after end of data: 550-5.7.1 [62.169.28.150 12] Gmail has detected that this message is likely 550-5.7.1 unsolicited mail. To reduce the amount of spam sent to Gmail, this 550-5.7.1 message has been blocked. For more information, go to 550 5.7.1 https://support.google.com/mail/?p=UnsolicitedMessageError a640c23a62f3a-b9b20250abbsi318855766b.53 - gsmtp ``` So, my server IP is 62.169.28.150 and the list in question is [email protected]. The list has been in existence for over two decades. I am at the end of my wits as to what is causing this and how to arrest the situation. If it matters, I also have listmonk on this server and which I use every so often to send, with successful delivery, over 10,000 emails. -- Best regards, Odhiambo WASHINGTON, Nairobi,KE +254 7 3200 0004/+254 7 2274 3223 In an Internet failure case, the #1 suspect is a constant: DNS. "Oh, the cruft.", egrep -v '^$|^.*#' ¯\_(ツ)_/¯ :-) [How to ask smart questions: http://www.catb.org/~esr/faqs/smart-questions.html]
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