[ale] routing port forwarding issues - help!

[Gary MacKay]

I have several email servers running qmail at various clients and can 
not send messages to certain domains. Most email works just fine, but I 
am seeing a growing number of domains that I can not send to.

I do not think my problems are related to qmail tho. I think it is more 
of a routing, firewall, etc. type issue. Reason is I can not even telnet 
to the IP addr on port 25 of the domains that are failing. I'm not sure 
how the firewall fits into the picture either since they are different 
at each site (ie. Netopia, Linksys, and OpenBSD). Obviously they are all 
doing NAT and port forwarding to/from the email server inside. Very 
typical/standard setup I'm sure.

At first I thought it had to do with the ISP, since all of the ones with 
problems, use the same ISP. That is the only common factor I could find. 
Then I discovered yesterday that I could telnet just fine from other 
machines on the network, just not the email server. Windows, Linux, 
etc,. Did not matter. Very weird. I checked this at the other client 
sites, and sure enough, it works from any machine other than the mail 
server. What am I missing here?

TIA,
- Gary


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