Telnet Configuration

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mnixon

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Joined
Jul 3, 2007
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I am working on a Postfix server and find that everything is operational inside the network (ie at the office). I can telnet to each of the ports open on the Linux box including port 25 INSIDE the network.

I can get to each port (ftp, Apache, ssh, etc) from outside the network (ie Home) with the exception of the SMTP (port 25). My first thought was that I had not opened the firewall and it was blocking this port; however, I have confirmed that the firewall is open and mail is being delivered.

Is there a way to check if my outbound port 25 is blocked? Is that something that is typical in a home DSL connection in the US?
 

JohnWill

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Joined
Oct 19, 2002
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106,418
It's VERY common for ISP's to block port 25, this is a SPAM prevention measure to prevent SPAMMERS from setting up a bunch of email servers.
 
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