Need help to configure sendmail

[John Macdonald]

On Tue, Dec 28, 2004 at 06:02:20PM -0800, Frank Peng wrote:
> I am using Sympatico at my home computer.
> 
> I do not have a static IP address. I update my IP
> address if it is changed so you can always get my web
> site at www.familywebhouse.com.
> 
> I thought sendmail should be the same as httpd. Since
> I am running sendmail and listening on port 25(I can
> telnet it locally), why I cannot listen to outside?
> How Sympatico block this? How do they know you are
> connecting me with port 25 since the name could be
> resolved and you can reach this IP address?
> 
> I did not understand. Thanks a lot!

You can listen to the outside, but Sympatico puts a barrier
in your way.  Any outside computer trying to talk to your home
computer has to send their packets through Sympatico's routers,
and Sympatico simply refuses to pass on port 25 packets.
They only allow smtp traffic that goes to or from their own
servers, and not between a customer machine and an outside
machine in either direction.

I switched to a different ISP when they started doing that,
because I wanted to continue use my own domain name, not just
a mailbox on their mail server.

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