Sender Verifacation email

Hi I am having issues receiving emails form one domain their admin believes that it must be because my server is doing sender verification and sending out a test email to ensure the sender is valid

by default what email address would the server be using when it sends out this type of email??

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Smallguy

here is the log form my server that he says proves we do sender veriifacation

2008-03-05 21:09:48 66.60.227.28 theirdomain.com SMTPSVC1 myserver 10.1.2.206 0 EHLO - +theirdomain.com 250 0 312 18 0 SMTP - - - -

2008-03-05 21:09:48 66.60.227.28 theirdomain.com SMTPSVC1 myserver 10.1.2.206 0 MAIL - +FROM:<user3@theirdomain.com> 250 0 47 34 0 SMTP - - - -

2008-03-05 21:09:48 66.60.227.28 theirdomain.com SMTPSVC1 myserver 10.1.2.206 0 RCPT - +TO:<USER2@mydomain.com> 250 0 37 34 0 SMTP - - - -

2008-03-05 21:09:48 66.60.227.28 theirdomain.com SMTPSVC1 myserver 10.1.2.206 0 RCPT - +TO:<user1@mydomain.com> 250 0 31 28 0 SMTP - - - -

2008-03-05 21:09:49 66.60.227.28 theirdomain.com SMTPSVC1 myserver 10.1.2.206 0 xexch50 - +2220+3 504 0 32 14 0 SMTP - - - -

2008-03-05 21:09:51 66.60.227.28 theirdomain.com SMTPSVC1 myserver 10.1.2.206 0 BDAT - +<4E529C3BFDB56546BCD196510C2A834DDFCA41@ABCMAIN.THeirdomain.local> 250 0 103 3695 2016 SMTP - - - -

2008-03-05 21:09:51 66.60.227.28 theirdomain.com SMTPSVC1 myserver 10.1.2.206 0 QUIT - theirdomain.com 240 2922 69 4 0 SMTP - - - -

2008-03-05 21:10:52 64.105.113.202 OutboundConnectionCommand SMTPSVC1 myserver - 25 RCPT - TO:<user3@theirdomain.com> 0 0 4 0 1375 SMTP - - - -

2008-03-05 21:10:52 64.105.113.202 OutboundConnectionResponse SMTPSVC1 myserver - 25 - - 250+user3@theirdomain.com+Address+Okay 0 0 39 0 1593 SMTP - - - -

hopefully this helps