Thanks. I did that but I'm still getting SeaMonkey's mailer when I click on a link in the browser.  I vaguely remember having to change a line in a Netscape folder years ago but don't remember the details.  I can copy the link location and start my own message in Pegasus.

Thanks again for your answer.
Rosalyn

P.S. I reinstalled SeaMonkey and using the custom install and did not install "Mail & Newsgroups".  That worked. 

I would like to have Pegasus open when I click on a mailto link in SeaMonkey.  How do I configure the browser to make that happen?

Thanks,

Rosalyn 

Take a look under Tools - Options... (Alt+F10) Incoming mail - Hyperlinks
Click on System mailer...