I want only outgoing emails from Odoo to my Gmail Account. 

I edited the default outgoing server (localhost) to Gmail smtp server and tested and found ok.

when I type the Email in Technical Settings -> Email -> Email --> Create and Send Now. The mail is delivered sucessfully to gmail account.

But when I send PO by Mail. the message is shown in the  Technical Settings -> Email -> Message and not in Technical Settings -> Email -> Email

and message is also not sent to the recipient. Please advise where can be the issue.