It's common to have the IP #
blacklisted if one #
self-host. In some cases port 25 is blocked by the #
ISP and hosting providers. At other times the big companies like #
Google, #
Yahoo, #
AOL, #
Microsoft, etc, may block the IP for various unknown reasons.
Here is a tutorial to relay mails from Postfix through other #
SMTP server. I assume that you have working Postfix server.
Note: If one #
relay through other server, it not only makes that server to send the mails on ones behalf, but allow the other server to know the #
content of the email and can change the content of the #
email too. Thus seen as a
big compromise.
That’s it!
Test it and see Postfix #
logs for traces of the mail.