imvpro,
Hmm, well the issue is an authentication issue, but I am not sure what gmail-smtp-msa.l.google.com is as I have never used that email server for GMail. My assumption is, since you couldn't answer question 3, is that you are using Enhanced Integration instead of Forward/Copy as that is not the server you use for that.
So, what you probably need to do is check all the mailboxes under Email Synchronization and verify that the information is correct.
Thanks,
TE