Exchange 2010 not sending to outside domains

Posted on 2011-04-29
Last Modified: 2012-05-11
Hello Experts, I have implemented exchange 2010 server in a Exchange 2003 environment, the e-mail exchange to and from exchange 2003 works 100%, I'm also able to receive e-mails from external domains, but am not able to send e-mails out to any external domain receipients. Below is the error in the message tracker, please advise:

Identity: MODAEXCOMVM1\Unreachable\123
Subject: lkjn;lknlkn;lkjm
Internet Message ID: <>
From Address:
Status: Ready
Size (KB): 3
Message Source Name: FromLocal
Source IP:
SCL: -1
Date Received: 4/28/2011 5:16:14 PM
Expiration Time: 4/30/2011 5:16:14 PM
Last Error: A matching connector cannot be found to route the external recipient
Queue ID: MODAEXCOMVM1\Unreachable
Question by:EddieIT
    LVL 7

    Expert Comment

    Did you create a new Send connector in Exchange 2010. If not delete the old one in Ex2003 and create it in Ex2010 under Org.Conf => Send connectors

    Author Comment

    the 2003 server only has teh group connector, I did not create any custom send connectors in the orgaanization. Is it nessesary to delete the 2003?
    LVL 3

    Accepted Solution

    Make sure the address space on the send connector is set to *. If you don't have send connector you will need to create one, by going to Orgnisation Configurattion --> Hub Transport server tab on EMC (Exchange management Console), make a right chose new send connector, give it a name( send connector ) , click down arrow define use for this connector Such as internet, follow the wizard and finish creating the send connector.

    Perform test mail, use queue viewer on the tool box to determine what is going on with the message.

    LVL 3

    Expert Comment

    Not nessesary,

    To drill down the problem, Please check the header and try to find out from which server it is bounced back. Also U can use mail flow troubleshooter from EMC Tools.
    LVL 3

    Expert Comment

    Also u check interpop routing group connector responsible to send mail from exch 2010 to 2003, (Which is created at the time of installation), address space is *.
    LVL 7

    Expert Comment

    if you don't have send connectors in 2003 then you just need to create the send connector in 2010

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