Other Connectivity > Business Connectivity > Problems sending email to charter.net

reply to LBDSL

Re: Problems sending email to charter.net

I assume the "time out" issue is permanent not a transient condition.

Whenever I've run into difficulty sending email from our domain reject message tends to have detail.

You've ruled out being blacklisted and rDNS. I assume you are running mail server on a "real" static commercial IP. What about SPF, have you set up DNS record?

/tom

Permanent is a good word for it. Has never worked.

SPF is good, I have the entry added to the name servers, has been working properly for 3 years. IP is "real", we have a /24. A tracert shows the last reply coming from 209.225.28-46-charter.net, before "timing out"

Charter.net is the only domain we have problems with. I've talked to a charter business rep, was able to send him email at his chartercom.com address just fine. Also can rx emails from charter.net, just not send to.

To me, it looks like something on charter's end of it, but I don't know for sure, and am having trouble getting any cooperation from them.

Any help is greatly appreciated. Thanks!

Ok, I think I have narrowed it down somewhat.

On my cisco router that interfaces with the T1, I can telnet to ib1.charter.net 25 without a problem (this is what the MX record points to).

On ANY machine beyond the cisco, it times out. My mail server is connected (through a switch) directly to the cisco, no firewall, etc. I cannot even ping ib1.charter.net from this side of the network.

BTW, ib1.charter.net (mail.charter.net) is the only domain I am having problems with. (that I know of anyway. we've been sending email to the rest of the world since the circuit has been installed, with no problem).

My limited knowledge of cisco IOS is holding me up here. It appears that the router is not passing traffic to ib1 for whatever reason.

Any idea of what I need to look at on the cisco? It is a 1720 w/ version 12.0(5)XQ1. I appreciate any help you guys can offer.

Thanks!