Author Topic: Wrong "Undelivered Mail Returned to Sender" message  (Read 2180 times)

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Wrong "Undelivered Mail Returned to Sender" message
« on: February 21, 2021, 09:36:55 PM »
When somebody sends an email to accounts in my server, the sender gets the message "Undelivered Mail Returned to Sender" but this is false and the receiver gets the mail. I ask, can you kindly guide me on where this problem should be found? The additional message says "host[] said: 550 5.7.1
Unfortunately, messages from [] 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
[] (in reply to MAIL
FROM command)"
Thank you!  :)