Is it possible to Use GMail as Mail Server for Electos?

In GuestBook sektion it's an option to test e-mail notifications and messages that belongs to GuestBook (Settings). In Control Panel Settings I configured Mail Server Settings to '', port 465, actual account name and password (standard encryption). When testing in GuestBook section I only got 'Send failed' after a while.

I would very much apreciate if somone could point me to a solution?

Kind Regards
Per T.