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
, 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
Test it and see Postfix #logs
for traces of the mail.