Need some SMTP troubleshooting help - Please!.

[Craig White]

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?

Craig