I have setup sendmail on RHEL 5 with MailScanner. All is working fine but from last week i am getting some problem with one user, when he is sending mail with attachment of any excel or word file it convert in to winmail.dat format at receipient end.
Sender is using ms outlook 2007 but previously he has ms outlook 2003
Receiver is using Mail Application based on MAC OS 10.5.
Please suggest me what could be the problem. i have changed nothing at server end.