--On May 19, 2008 10:15:25 PM -0400 Sahil Tandon <[EMAIL PROTECTED]> wrote:

On May 19, 2008, at 4:17 PM, Montag wrote:

host mx1.free.bsd.org said: my.mywebsite.com: Helo command rejected:

Are you sure it wasn't mx1.freebsd.org?  And are you mangling
my.mywebsite.com or is that really the hostname with which your server
is  configured to EHLO/HELO?  The FreeBSD MXs also run Postfix and
employ the  reject_unknown_helo_hostname restriction; it rejects HELO
and EHLO hostnames  that lack DNS A or MX records.  Your log excerpt
looks suspicious because  my.mywebsite.com does have a valid DNS A
record:

        my.mywebsite.com.       96      IN      A       208.87.33.150

Yes, but this is a bit weird.

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.

Macintosh:~ pauls$ dig +short nullmx.mywebsite.com
209.181.247.105

But it *is* the MX for that domain.

Macintosh:~ pauls$ dig -t MX mywebsite.com

; <<>> DiG 9.4.1-P1 <<>> -t MX mywebsite.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49578
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 3

;; QUESTION SECTION:
;mywebsite.com.                 IN      MX

;; ANSWER SECTION:
mywebsite.com.          300     IN      MX      10 nullmx.mywebsite.com.

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.

Paul Schmehl ([EMAIL PROTECTED])
Senior Information Security Analyst
The University of Texas at Dallas
http://www.utdallas.edu/ir/security/

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