reverse hostname

(Windows 2003 server R2 sp2, Exchange system Version 6.5.7638.1)

We are having problems with mails being delayed to some recipients. We get:
Action: delayed
Status: 4.7.1
Diagnostic-Code: smtp;450 4.7.1 Client host rejected: cannot find your
reverse hostname, [wrong reverse adress]

When we look at the header of the mail that we are sending, it is really the
wrong reverse hostname address, but we are unable to locate who inserts the
reverse host name into the e-mail, is it exchange? If it is where is the
reverse address located so we can change it?

The reverse zone is maintained by your ISP who allocated your external IP
addresses. You need to get them to set up a reverse entry for your mail
server address.
If you have multiple IPs on your Exchange server you might also encounter a
problem. You might have port 25 listening on one address, but actually be
sending on another. You can either fix the IP's, or set up another reverse
entry for the sending address.
The receiving mail server is trying to check whether the IP address actually
reverses back to the name the server says it is. If it doesn't, he's
suspicious and drops it,
Anthony, http://www.airdesk.co.uk




"filip" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> (Windows 2003 server R2 sp2, Exchange system Version 6.5.7638.1)
>
> We are having problems with mails being delayed to some recipients. We
> get:
> Action: delayed
> Status: 4.7.1
> Diagnostic-Code: smtp;450 4.7.1 Client host rejected: cannot find your
> reverse hostname, [wrong reverse adress]
>
> When we look at the header of the mail that we are sending, it is really
> the wrong reverse hostname address, but we are unable to locate who
> inserts the reverse host name into the e-mail, is it exchange? If it is
> where is the reverse address located so we can change it?
>