Hi, I have Exch 5.5 sp3 (on NT4) for mail server and installed outlook 2000 on clients desktop.But one client install windows xp and outlook 2002.When I mail an exe file to a distribution list (group), everyone receives the mail and the exe file. But he only receive my mail and not the exe file, if other attachment like powerpoint file he can receive. The error message included in the email is 'Outlook blocked access to the following potentially unsafe attachments:PTSfull.exe' Is there a way that I could configured so that he could receive the exe file? I mean without renaming the extension file. Maybe configured in his desktop registry or in the Exch server ?