Delay sending to some domains - Exchange 2003

Posted on 2006-05-23
Last Modified: 2010-03-06

I just replaced our win 2k /exch 2k server with a new dell with SBS 2k3 which uses exch2003 sp2.  I migrated all mailboxes with exmerge and all is well on that front.

My problem is that when users send mail to certain domains, we get a delayed message.  Those domains are, and along with a few others.  Sometimes the mail goes through after hours and sometimes it does not.  

I am the IT consultant for and we don't use any blacklists and we do not have any restrictions on receiving mail to that server.  And, we were able to send to them and MSN and Hotmail on Friday before I switched the servers.

Our mail server is and we have the appropriate reverse DNS records so I think it is something in the exch2k3, but I don't know what.

I know exchange but have never needed to use the logging feature.  is there a log that I can turn on to help me see why the messages are being delayed?  Can I log the incoming at to see if the message is reaching that server and why it was sent back or even if it reached that server?

I searched for previous posts and followed their recommendations such as excluding the exch folders from the symantec anti virus and checking my dns.  None of that seemed to help.  Does anyone have any other suggestions?


Question by:mstefani
    LVL 104

    Expert Comment

    Do you need those other servers in the MX records?

    If not, I would pull them out to start with.

    Delay messages aren't much use, you need the failure messages.

    Does the server do nslookups for MX records correctly?
    Have you configured forwarders on the DNS Server applet to use the ISPs DNS servers?


    Author Comment

    Hi Simon,  Thanks, for the response.  I was going to pull out the extra mx records, but they should not be the cause of this issue since they have been there for weeks and this problem only started when I put the new server in over the weekend.

    If you mean can I ping the mail server, the answer is yes.  I can also telnet on port 25 to it and say HELO and get the ip of our server in response.

    The ISP DNS servers are forwarders in my DNS server properties.  They are SBC's forwarders and

    any other thoughts????



    Author Comment

    Problem solved.  It was the anti virus.  even though I excluded the exchange folders as recommended, it was not until I uninstalled the Symantec antivirus client that the email started flowing to the domains that were previously blocked.

    Why it only picked certain domains to block is beyond me.  Maybe someone can shed some light on that topic.


    LVL 104

    Expert Comment

    Its a Symantec product. Who knows why it does what it does. I simply don't deploy Symantec applications and as such don't have any issues with the networks that I manage.


    Accepted Solution

    PAQed with points refunded (250)

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