ISP blocking port 25 outbound
Posted on 2004-09-27
My ISP just started blocking port 25 outbound to reduce spam. Don't get me started on my feelings baout this, but basically they said if I want unfiltered access I would need to upgrade to the business plan which is double the cost. Anway, I have sendmail on a remote server that I use to send email. I have it to listen on port 25 and now I would like to have it listen on port 2525 as well which is not blocked. The server uses TLS.
If I add DAEMON_OPTIONS(`Port=2525, Name=MTA, M=Ea') to the sendmail.mc then it stops listening on port 25. If I add
DAEMON_OPTIONS(`Port=smtp, Name=MTA, M=Ea')
DAEMON_OPTIONS(`Port=2525, Name=MTA, M=Ea')
Then it listens on both ports but when someone tries to send me email I get a proper authentication required error. Can someone help? Thanks.