I have setup sendmail to use port 26 as smtp, I have no problem sending internal email but when I send external email eg. yahoo mail, it keep showing the following errors
Deferred: Connection timed out with mx4.mail.yahoo.com.
Message could not be delivered for 5 days
Message will be deleted from queue
I have no problem receiving external email because I use a mail port redirection from port 25 to port 26 as my ISP had block port 25
Any idea how to resolve this problem?