Problem Sending Mail With Postfix

[Sahil Tandon]

* Paul Schmehl <pauls at 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.

> So I've got no idea why he's having this problem, unless it's because the 
> MX record doesn't point to my.mywebsite.com.

Pure conjecture, but I think in trying to avoid exposing his machine's real 
hostname, he just wrote my.mywebsite.com, which just so happens to be an 
actual hostname.  Otherwise, I am similarly perplexed.

-- 
Sahil Tandon <sahil at tandon.net>