[exim] state.gov users cannot send to my exim mail server

Hi List,

I have been having issues with state.gov users not been able to send
mails to my exim mail server. this is the error message they get when
they try to send to my server and if i check on the logs i see no
attempted delivery from their servers. this was the error massage one of
the state.gov users forwarded to my free yahoo account. anyone enconter
this kind of problem with exim?

  ----- Transcript of session follows -----
        451 4.4.1 reply: read error from mail.mydomain.
        451 4.4.1 reply: read error from newmail.mydomain
<**@mydomain>... Deferred: Connection reset by
        newgmail.mydomain
        Warning: message still undelivered after 4 hours Will keep
trying until
        message is 1 day old

        --p2LHIwt6029028-p2LHIwt6029028.1300728611/l.mydomain.com.
        451 4.4.1 reply: read error from newmydomain.com
        <***@mydomain.com>... Deferred:
        Content-Type: message/delivery-status

        Reporting-MTA: dns; l.qanet.gm.
        451 4.4.1 reply: read error from newmydomain.com
        <****@mydomain.com>... Deferred: Connection reset by
        newmydomain.com
        Warning: message still undelivered after 4 hours Will keep
trying until
        message is 1 day old on/pdf
        Arrival-Date: Mon, 21 Mar 2011 08:07:13 -0400

        Final-Recipient: RFC822; ****@mydomain.com
        Action: delayed
        Status: 4.4.2
        Last-Attempt-Date: Mon, 21 Mar 2011 13:30:11 -0400
        Will-Retry-Until: Tue, 22 Mar 2011 08:07:13 -0400