Windows:
We’ll need to modify a registry key for this one.
Looking under [HKEY_CLASS_ROOTmailtoshellopencommand]
You’ll need to change the default key to the following (Changing youdomain.com to your domain)
rundll32.exe url.dll,FileProtocolHandler http://mail.google.com/a/
yourdomain.com/?extsrc=mailto& url=%1
OR
A reg file can be created also for use in a script
1. Open Notepad and paste the following
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOTmailtoshellopencommand]
@=”rundll32.exe url.dll,FileProtocolHandler http://mail.google.com/a/bethelsd.org/?extsrc=mailto&url=%1″
2. Save as googlemailto.reg
Mac:
You can use webmailer to set this up. I’m working on a script that copies the webmailer.app and the preference over then changes the default mail client.
Webmailer
Webmailer