Problem Sending Mail With Postfix

Sahil Tandon sahil at
Tue May 20 03:28:46 UTC 2008

* Paul Schmehl <pauls at> [05-19-2008]:

> Macintosh:~ pauls$ telnet 25
> Trying
> Connected to
> Escape character is '^]'.
> 220 nullmx SMTP
> 220 Hello
> quit
> 220 Buh-bye!
> Connection closed by foreign host
> Why ""?  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

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

Sahil Tandon <sahil at>

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