Need some SMTP troubleshooting help - Please!.

[Craig White]

On Wed, 2008-03-12 at 21:28 -0700, Bryan O'Neal wrote:
> The email is not being delivered,
> 1) I tried sending to a yahoo account I could verify and it did not
> arrive, spam filter or no.
> 2) My mail  server believes it can not open a connection.
> 3) I can not seem to get a telnet connection.  I have tried 'telnet
> mail.yahoo.com 25' and 'telnet yahoo.com 25' from every ISP I can find
> (COX, QWEST, TWTC, etc.) but it just times out.  Same for AOL, and other
> major providers.  No luck their unless some one has a better way to do
> it.
> 
> -----Original Message-----
> From: plug-discuss-bounces at lists.plug.phoenix.az.us
> [mailto:plug-discuss-bounces at lists.plug.phoenix.az.us] On Behalf Of
> Craig White
> Sent: Wednesday, March 12, 2008 7:34 PM
> To: Main PLUG discussion list
> Subject: Re: Need some SMTP troubleshooting help - Please!.
> 
> 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
> before.
> > 
> > Any suggestions on how to figure out what the *&!@$#! is going on with
> 
> > my SMTP connections to Yahoo?
> ----
> #1 get a mail account on yahoo so you can send e-mail to yourself and
> check it to see if it's delivered...they're free
> 
> #2 I suggested that you try an SMTP connection via telnet so you can
> visually monitor what is being said...did you do that?
> 
> #3 Is it possible that your ip address(es) are listed in some DNSBL?
> Have you checked?
> 
> #4 Is it possible that the e-mail is delivered to a 'spam' directory
> instead of people's INBOX?
----
host -t mx yahoo.com
yahoo.com mail is handled by 1 f.mx.mail.yahoo.com.
yahoo.com mail is handled by 1 g.mx.mail.yahoo.com.
yahoo.com mail is handled by 1 a.mx.mail.yahoo.com.
yahoo.com mail is handled by 1 b.mx.mail.yahoo.com.
yahoo.com mail is handled by 1 c.mx.mail.yahoo.com.
yahoo.com mail is handled by 1 d.mx.mail.yahoo.com.
yahoo.com mail is handled by 1 e.mx.mail.yahoo.com.

$ telnet f.mx.mail.yahoo.com 25
Trying 209.191.88.247...
Connected to f.mx.mail.yahoo.com.
Escape character is '^]'.
220 mta341.mail.mud.yahoo.com ESMTP YSmtp service ready
QUIT
221 mta341.mail.mud.yahoo.com
Connection closed by foreign host.

took 10 seconds

Craig