With port 25 blocked will this affect me getting emails to my domain? Because I can send mail but not receive. Is there a way to tell the world your using a different port for mail or no through DNS?
depends, if both incoming and outgoing port 25 are blocked. I noticed the other day that my ISP blocks now outgoing port 25 because it's often used for spam. According to their info I now added port 587 to postfix (as well as port 2500 and 2525 - just to be sure). The problem was that the only port 25 traffic on my isp is allowed to go through my ISPs mailserver now. Every other port 25 traffic is blocked.
Yes both incoming and outgoing are blocked for port 25, so what else can I do to receive email from my server? I heard you can use smtp relay or somethng like that, how does this work? Thanks
