Iv’e setup iRedMail on an Ubuntu 12.04 server.
But for some reason whenever I send a mail, it sends me another mail to me after some time saying “Undelivered Mail Returned To Sender”.
Moreover, I cant receive any emails either. Iv’e tried sending emails using Yahoo to my servers. And I do not even get the “Mail not sent email” either.
Thanks in Advance!
Submit an answer
This textbox defaults to using Markdown to format your answer.
You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!
These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.
Could you pastebin the full message with headers for the “Undelivered Mail Returned To Sender” mail? If you are receiving that, the issue is not that you are having your SMTP port blocked. It’s somewhere further down the line.
Check your DNS configuration.
DO blocks outgoing mail, file a ticket.