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Sat, Jul 17, 2021 7:31 AM

are ports for Email blocked?

I'm setting up a self hosted email service, but I know that most ISPs block forwarding the ports necessary for this. Before I go through the nightmare of setting up an email server, I want to know if at&t blocks these ports so that I know if its even worth it to set up the server. If the ports are blocked, is there a way to unblock them?


Community Support


172.6K Messages

3 m ago

Hi, @LucasVL, we're happy to answer your email port questions!


Some ports, such as 25 are blocked from our network.


You can see the full list of blocked ports in our article on Network Practices.


We block certain ports that transfer malicious or disruptive traffic to protect our customers and our network, so if a port is blocked, it cannot be unblocked.


Thank you for contacting the AT&T Community Forums team!


If you need help with anything else, we'll be here.


Aminah, AT&T Community Specialist

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