Exchange resolving MX record to IP wrong?   

Hi,

I have a Windows 2000 Server with Exchange Server 2000, runnig in my LAN, 
with internal IP (192.168.1.1). This server is used to send external e-mails. 
I don't use the SMTP from the my ISP.

The mails is sent no problem. But in a few cases, the mails return with NDR 
<mydomain #5.7.1 smtp;550 5.7.1 Unable to relay for...
This messages occur when we send mail to my domain hosted in the my ISP only.

My domain is hosted in my ISP and the MX record is there too.

I saw my Exchange logs and in the e-mails with NDRs, the Exchange is 
resolving MX records wrong. It's getting the IP address from the WebServer 
instead MailServer.

I tried ping smtp.mydomain.com and the IP returned is right.

The wrong resolution is occuring in a few cases, in the most of the e-mails 
sent the Exchange is resolving right the IP address.

Anyone can help me?

Thanks by help.

date: Mon, 16 May 2005 13:31:05 -0700   author:   Hacinn

Re: Exchange resolving MX record to IP wrong?   

check the DNS that Exchange is using

-- 
David Sengupta M.T.S., B.Sc., MCSE, Exchange MVP, CCA
Ottawa, Canada

Whitepaper: e-Discovery for Exchange Environments
http://wm.quest.com/msnewstb

"Hacinn"  wrote in message 
news:8D156622-D09D-4C68-B9F9-886005AE7FC9@microsoft.com...
> Hi,
>
> I have a Windows 2000 Server with Exchange Server 2000, runnig in my LAN,
> with internal IP (192.168.1.1). This server is used to send external 
> e-mails.
> I don't use the SMTP from the my ISP.
>
> The mails is sent no problem. But in a few cases, the mails return with 
> NDR
> <mydomain #5.7.1 smtp;550 5.7.1 Unable to relay for...
> This messages occur when we send mail to my domain hosted in the my ISP 
> only.
>
> My domain is hosted in my ISP and the MX record is there too.
>
> I saw my Exchange logs and in the e-mails with NDRs, the Exchange is
> resolving MX records wrong. It's getting the IP address from the WebServer
> instead MailServer.
>
> I tried ping smtp.mydomain.com and the IP returned is right.
>
> The wrong resolution is occuring in a few cases, in the most of the 
> e-mails
> sent the Exchange is resolving right the IP address.
>
> Anyone can help me?
>
> Thanks by help.
>
>

date: Wed, 18 May 2005 00:23:00 -0400   author:   David Sengupta [MVP] sengupta@*NO*ncf*SPAM*.ca