[exim] Cannot send mails to @hotmail.com addresses

Hello,
I have set up an exim installation, trough which i can easily send mails
to everyone, except for mail addresses that belongs to hotmail.com(or
.it) domain.
This is the excerpt from the exim mainlog:
> 2007-06-10 13:42:19 SMTP connection from [88.149.122.125]:3936
> I=[82.195.162.138]:25 (TCP/IP connection count = 1)
> 2007-06-10 13:42:22 1HxRQk-0001IE-3c <= [EMAIL_PROTECTED]
> H=88-149-162-252.f5.ngi.it ([192.168.1.105]) [88.149.122.125]:3936
> I=[82.195.162.138]:25 P=esmtpsa X=TLSv1:AES256-SHA:256 CV=no
> A=plain:[EMAIL_PROTECTED] S=730 id=466C382E.5070302@???
> T="hotmail test!" from <[EMAIL_PROTECTED]> for [EMAIL_PROTECTED]
> 2007-06-10 13:42:22 SMTP connection from 88-149-162-252.f5.ngi.it
> ([192.168.1.105]) [88.149.162.252]:3936 I=[82.195.162.138]:25 closed
> by QUIT
> 2007-06-10 13:42:22 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc
> 1HxRQk-0001IE-3c
> 2007-06-10 13:42:23 1HxRQk-0001IE-3c => [EMAIL_PROTECTED]
> F=<[EMAIL_PROTECTED]> P=<[EMAIL_PROTECTED]> R=dnslookup T=remote_smtp
> S=753 H=mx1.hotmail.com [65.54.244.136]:25 C="250
> <466C382E.5070302@???> Queued mail for delivery" QT=1s DT=1s
> 2007-06-10 13:42:23 1HxRQk-0001IE-3c Completed QT=1s
The mail simply does not arrive in hotmail inbox nor in spam box.Seems
like it is silently deleted from hotmail servers,but I don't receive any
reject mail back or any other feedback.
Any suggestions?
thank you