You will need to provider your own mailto URL handler.
See the HKEY_CLASSES_ROOT\mailto registry hive.

Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool

"Peter" wrote in message
...
What is responsible for opening an email client or a new mail form when a
user clicks on an email address (say in a webpage). Is there a way to get
the email address that is clicked even before a new mail form is opened.
How to override the defaul email client to implement open custom email
form.