Set the Reply action on the custom form to use the custom form instead of IPM.Note.

--
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx

"HHo" wrote in message news

Is it possible to set if we received a Custom Form email, then we will Reply
it as a Custom Form email. However, if we received standard outlook email
then we will automatically Reply using standard outlook email? How to do it?