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Date: Tue, 20 May 2008 00:07:21 -0400
From: Sahil Tandon <sahil@tandon.net>
To: Paul Schmehl <pauls@utdallas.edu>, freebsd-questions@freebsd.org
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* Sahil Tandon <sahil@tandon.net> [05-19-2008]:

> * Paul Schmehl <pauls@utdallas.edu> [05-19-2008]:
> 
> > Macintosh:~ pauls$ telnet my.mywebsite.com 25
> > Trying 209.181.247.105...
> > Connected to nullmx.mywebsite.com.
> > Escape character is '^]'.
> > 220 nullmx SMTP
> > EHLO testing.mydomain.com
> > 220 Hello
> > quit
> > 220 Buh-bye!
> > Connection closed by foreign host
> >
> > Why "nullmx.mywebsite.com"?  Which resolves to an entirely different IP 
> > address.
> 
> Perhaps the admin routes all port 25 traffic to nullmx.

Actually, I am wrong here.  This is happening on your machine because you are 
using telnet on OS X Leopard:

	http://chip-miller.net/2008/03/14/solving-a-dns-mystery-on-os-x/

Try telnet from a FreeBSD (or any other) machine, and you will get:
	
	# telnet my.mywebsite.com 25
	Trying 208.87.33.150...
	telnet: connect to address 208.87.33.150: Connection refused
	telnet: Unable to connect to remote host
	
-- 
Sahil Tandon <sahil@tandon.net>