[SLUG] Port blocking on Verizon

From: Paul M Foster (paulf@quillandmouse.com)
Date: Tue May 04 2010 - 15:45:13 EDT


I feel silly asking this question, since I've been working with Linux
for over 15 years. But I've just never had to deal with the issue
before.

Verizon FiOS (which I have) is, starting 8 June, going to block port 25
for customers who don't use Verizon's mail servers (which I don't).
Their alternate port is port 587. As I understand it, I'm supposed to
change my settings to this port, and all will be cosmic.

Here's the thing, though. I tender mail to my local mailserver, which
connects to my internet mailhost via port 25. If I set my local
mailserver to connect via port 587, I can see how this would avoid
Verizon's port blocking. But my internet mailhost still wants to see a
connection on port 25. So does Verizon, when it sees a connection via
port 587 to an internet mailhost, then change the port to port 25 (which
is what my internet mailhost wants)?

Can someone explain how this works?

Paul

-- 
Paul M. Foster
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