Can you be more specific?
I.e., you are saying that you write an email to "recipient@comcast.net", click Send, and the email shows up in your email Draft Folder - correct?
And that the recipient never receives the email?
I do not have Outlook 2010 per se but Outlook has been consistent in many things.
Take a look at the default settings and rules.
E.g., Under New Mail, check Options and see "Save Sent Item to".
Probably some misconfiguration therein.....