Odd Qmail Problem

I'm having an issue sending email from my server. Linux Redhat 9. 2.4 kernel. Qmail. I have vBulletin insalled, from vBulletin's diagnosis section in the admincp, if I send a test email to my @comcast.net account I never get the email. If I send another test email to my @yahoo.com account I get it fine. If I telnet localhost 25 while sshd into my server I can

<Test Sending to @yahoo.com>
[chad@<mydomain> chad]$ telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 localhost.localdomain ESMTP
helo <mydomain>
250 localhost.localdomain
mail from: me@yahoo.com
250 ok
rcpt to: me@yahoo.com
250 ok
data
354 go ahead
To: me@yahoo.com
From: me@yahoo.com
Subject Test Email
this is some email

.
250 ok 1092874965 qp 28551
quit
221 localhost.localdomain
Connection closed by foreign host.

<Test Sending to @comcast.net>
[chad@<mydomain> chad]$ telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 localhost.localdomain ESMTP
helo <mydomain>
250 localhost.localdomain
mail from: me@yahoo.com
250 ok
rcpt to: me@comcast.net
250 ok
data
354 go ahead
To: daltonch@comcast.net
From: white_2kgt@yahoo.com
Subject: Test
this is some test email

.
250 ok 1092875088 qp 28576
quit
221 localhost.localdomain
Connection closed by foreign host.
[chad@<mydomain> chad]$

I receive BOTH emails one to my @yahoo.com and one to my @comcast.net account. How does one explain this or better yet resolve it? I can't for the life of me understand this problem. I've also tried this with a .gov and a .speakeasy.net email domain. None of those domains receive email when sent via the vB software but fine if I just send it via the telnet?

Please help, I'm at my wits end.

thanks,
-c

 

 

 

 

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