If you use web-based client, the process is not that painful after setting mailto: handler correctly. As for actual SSO integration I believe it depends on #277744.
http://googlesystem.blogspot.com/2012/02/open-mailto-links-using-gmail-in-google.html -- anatoly t. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org