Fix for android outbox - stuck messages (gmail)
I have read all there is to offer on various blogs and help sites, none of which permanently fix the problem of email messages getting stuck in the Droid's default email application's outbox. I think I've found the solution.
The issue is a conflict between your separate gmail application (which is mandatory on the Droid software and cannot be removed) and the default Droid email application, which usually appears in the home screen's base line (along with the phone and browser apps).
The email app and the gmail app are fighting for gmail's smtp server attention, and the gmail app always wins.
Here are your solutions:
1. Give up on using the default email application and just use the gmail app.
2. Tell your Droid not to sync gmail to your gmail app. By disabling the gmail sync in your google account set up with your Droid, you still have access to syncing the contacts, calendar and picassa, but the separate gmail app won't be active. You do this by going to Settings -> Accounts and sync -> then to your gmail account listed under "Manage accounts" -> then uncheck the "Sync Gmail." You can also remove the account altogether if you don't care to sync google calendar, contacts or picasa albums. Your email account using IMAP or POP3 access to gmail is unaffected by this sync, and is determined through the account settings within your default Droid email program.
This worked for me. Good luck to you all!
JPK