I thought something similar, but we are going on a week and a half now and it has never expired. I even checked with my Yahoo users and they are using the web client only, which further leads me to believe this is not the issue..

From: plug-discuss-bounces@lists.plug.phoenix.az.us [mailto:plug-discuss-bounces@lists.plug.phoenix.az.us] On Behalf Of Charles Jones
Sent: Thursday, March 13, 2008 9:34 AM
To: Main PLUG discussion list
Subject: Re: Need some SMTP troubleshooting help - Please!.

Thank you, indeed I do get a hard reject saying that they are refusing mail from my IP. Only Yahoo is doing this and I am not on any of the major spam lists but someone out their does not like me. I would check out DNSSTUFF, but I would rather not pay them their annual subscription fee (With auto renew) for a one time search; are their any free black list search service out their? Or can some one who does have an account please search DNSSTUFF for me on one of my IP's? (66.193.205.166) 553 Mail from 66.193.205.166 not allowed - [10] -----Original Message----- From: plug-discuss-bounces@lists.plug.phoenix.az.us [mailto:plug-discuss-bounces@lists.plug.phoenix.az.us] On Behalf Of Richard Wilson Sent: Wednesday, March 12, 2008 9:49 PM To: Main PLUG discussion list Cc: Arizona State University Linux Users Group Subject: Re: Need some SMTP troubleshooting help - Please!. You can check your IP address on dnsstuff.com -- one of their services checks to see if you're listed on any of 200+ Antispam services. You can also try a manual session, doing a telnet to a.mx.mail.yahoo.com (or any of their other mail relays -- "dig yahoo.com mx" will give you the list) and seeing what it is they don't like about you (I assume conerstonehome.com in the example that follows): telnet a.mx.mail.yahoo.com 25 (wait for CONNECT msg) HELO mailserver.cornerstonehom.com (wait for 2XX response) MAIL From: <id@cornerstonehome.com> (wait for response) RCPT To: <id@yahoo.com> (wait for response) DATA send something here . QUIT You may get a 4XX ("soft"/temp) or 5xx (Hard) reject on one of the responses that should indicate why they don't like you. HTH, Richard Wilson (yes I have the "privilege" of getting mail addressed to postmaster at too darn many domains...) ------------------------------------------------------------------------ --- On Wed, 2008-03-12 at 19:23 -0700, Bryan O'Neal wrote:

Ok I have a problem in that I am (still) unable to send anything to Yahoo, or any domain who's email is hosted by Yahoo. I don't get a NDR, it is as if I simply can not connect and I get nothing in my logs! I believe it is connection oriented because three boxes (Two exchange domains and one sendmail) with three external IP's have one common point and that is one border router with one T1 connection. But I can not get any response out of Yahoo and I can not give any details because I have never had to trouble shoot down to this level