No outgoing mail on my Exchange 2010 server

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    Hi everyone,

    I’ve some problems sending mail outside my org.
    The situation is as follows:

    – Windows 2008 R2 server running XWall in my DMZ zone
    – Windows 2008 R2 server running Exchange 2010 (Mailbox, CAS, Hub and UM roles)

    Incoming mail is ok, internal mail too.

    I’ve created a Send Connector
    FQDN EXCH01.domain.local
    Address space * Cost 1
    Network Smart Host: IP of my XWall server
    Source Server: EXCH01

    telnet port 25 from XWall to EXCH01 works
    telnet port 25 from EXCH01 to XWall works
    When i send a mail it is queued in exchange with error 451 4.4.0 421 4.2.1 Unable to connect. I don’t see any incoming connection on my XWall server so I presume the problem is within Exchange or maybe DNS?

    I’ve already searched on the net found several topics but no solution for me.

    When I run the Mail Flow Troubleshooter I get one error:
    Mail acceptance failure (Remote server EXCH01 failed the mail acceptance test when trying to open the remote socket. Respond = Remote socket is not available.

    The server in my DMZ zone had the EDGE role before I’ve installed XWall and it also didn’t work for outgoing mail. That’s why I ‘m now trying with XWall.

    I hope someone can give me some advice.


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