Queue errors

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    nukunu
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    #154720

    Mails from my Exchange 2010 server to some particular domains were hanging in the queue. When I made a switch of my sending hub transport server to Exchange 2007 by editing the source server on the Send Connector, the mails flew out of the queue. After 24hrs the 421 4.4.2 Connection dropped errors are still evident even on the 2007 Hub transport server. I still cant figure out what the problem is.
    Below are some logs from the SmtpSend transport logs.

    Sending Mail to Yahoo:
    #local address#:,98.137.54.238:25,>,HELO #mydomain.com#
    #local address#:98.137.54.238:25,< ,250 mta1060.mail.sp2.yahoo.com
    #local address#:98.137.54.238:25,*,80,sending message
    #local address#:98.137.54.238:25,>,MAIL FROM:< #me#>,
    #local address#:,98.137.54.238:25,< ,250 sender <#me#> ok
    #local address#:98.137.54.238:25,>,RCPT TO:,
    92.168.220.22:48068,98.137.54.238:25,< ,250 recipient ok,
    #local address#:48068,98.137.54.238:25,>,DATA,
    #local address#:48068,98.137.54.238:25,< ,354 go ahead,
    #local address#:51839,209.85.143.27:25,< ,451 4.4.2 Timeout - closing connection. m53si6769786wej.87,
    #local address#:51839,209.85.143.27:25,>,RSET,
    #local address#:51839,209.85.143.27:25,-,,Remote
    74.125.79.27:25,*,,attempting to connect
    #local address#:48069,74.125.79.27:25,+,,

    Other Domains(gmail):
    213.199.180.150:25,< ,451 4.7.0 Timeout waiting for client input,
    213.199.180.150:25,>,RSET
    213.199.180.150:25,-,,Remote
    135.245.0.37:25,-,,Remote
    _____________________________________________
    192.160.6.149:25,< ,"354 Enter mail, end with ""."" on a line by itself",
    attempting to connect

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