MAIL app probelms

Hi guys,

I'm having trouble with my MAIL app. I saved an email in Drafts a few days ago, and just sent it out recently. However, there was a problem during the sending. Several copies of the same email were sent to the recipient. After restarting my computer and the application a message keeps popping up stating:

Some actions taken while the account "my acct name" was offline could not be completed online. Mail has undone actions on some messages so that you can redo the actions while online. Mail has saved other messages in mailbox “On My Mac” in “On My Mac” so that you can complete the actions while online.
Additional information: The connection to the server “imap.gmail.com” on port 993 timed out.
or
Additional information: The IMAP command “APPEND” (to Drafts) failed with server error: Could not parse command.

Along with this message the same email shows up in my Drafts folders. I've deleted many copies of them, but they keep coming back the same way. I'd also like to mention that that particular email account is not getting mail for me, but the app is getting mail for my other emails. All accounts are online. I'm not sure what to do. HELP PLEASE! Does anyone have any ideas?

Thanks!