Reverse DNS Lookup and EHLO greeting in MS Exchange 2003 problem

Posted on 2006-07-12
Last Modified: 2006-11-18
   Our Exchange 2003 server keeps getting blacklisted by means of
< #5.5.0 smtp;553 Bogus helo jdesk. <>>
I have contacted our ISP and setup reverse dns for our IP to I have also gone under the SMTP virtuial server in exchange 2003 manager and set the FQDN to as described in:

But I do not beleive this have been configured correctly still. We keep getting blocked and I have ran SmtpDiag.exe from Microsoft and it still reports our mail server saying ehlo as instead of When I telnet to our server it welcomes me as

Does anyone know if this discrepensy would be casusing us to keep being blocked?
I have changed our FQDN is in the "Default SMTP Virtual Server" to but it is still ehlo as, does anyone know where I can change this?
Question by:blkburn
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LVL 104

Accepted Solution

Sembee earned 500 total points
ID: 17092084
Go to and see what that says. That shows how the Internet sees your server.


Author Comment

ID: 17092216
   The report told me that my Mx reccord is not host name instead it's an IP. I will correct this and see if it fixes, but I don't think that solves it would have anything to do with the bogus ehlo would it? Everyhting else said it checked out ok.
LVL 104

Expert Comment

ID: 17092272
That would cause some sites to fail. An IP address is not valid for MX records, so anyone doing a check to see if the domain is valid would fail that test.


Expert Comment

ID: 17092489
sounds like Rdns is not setup correctly.


choose reverse dns, type in your mail server's ip address. (not domain name)

it should return

Author Comment

ID: 17092603
    Thank you for the comment. The reverse DNS from our IP is setup to but our Exchange server is staying ehlo as I went to the site and it checks out ok.

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