hotmail problem

hu guys!

I run a dedicated and use exim as mail server. First i couldn't mail to gmail & hotmail inbox . after updating exim & restarting the server i could send mail to gmail inbox but the mail never goes to hotmail (not even junk).
This was taken from the exim log and it shows the mail was sent:

Code:

2007-05-31 15:10:33 1Htqye-0007mP-Ur => ****@hotmail.com R=lookuphost T=remote_smtp H=mx1.hotmail.com [65.54.244.8]
2007-05-31 15:10:33 1Htqye-0007mP-Ur Completed

Is there anything i could do or any optimization i can do to exim in order to send mails to hotmail and be mnore efficent in general ?

thanks..