Sparrow (native mail app)

Use the link to open the Mail app

mailto://

put an email after the ://   (No space)

to edit an email being sent to that email

example -     

mailto://ehamawy@gmail.com

Application homepage: mailto://
iTunes link: None. It's a stock app
HTML Link example: mailto://
Native application URL string example: mailto://
Extended example:
Tags: sparrow mail app stock

Just do mailto://name@gmail.com