[ale] routing port forwarding issues - help!

[Dow Hurst]

What is the result from a traceroute for these machines that don't 
respond to a  telnet to port 25?  Do you know whether the  other 
machines that you can get to on these LANs will respond to a port 25 telnet?
Dow


Gary MacKay wrote:

> 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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