How to Use the Mailto Syntax – Examples
The mailto protocol lets you create hyperlinks that will directly launch the default email software and compose a new email message. Mailto commands in Firefox even work with web mail programs like Gmail.
mailto
Open Email Links on Web Pages with Gmail or Yahoo Mail
You can now open email links directly inside web mail programs like Gmail, Yahoo! Mail or you could configure mailto with any desktop based email client like Outlook, Windows Live Mail or Thunderbird.