Mail suddenly hogging network usage

I have been using the mail app for years and just the other day it started spiking my network usage to the point that I cannot leave mail open at all.
Initially, the account in question had the loading wheel on it constantly even though there was nothing reported in the mail activity window. After browsing some forums I tried deleting mails prefs but that didn't solve the problem. Now there's no loading wheel but it still hogs network.
I've read that this may be because I tried to send something with a large attachment, which I recently have, so I'm guessing this is the problem but I have no clue how to fix it. I went on gmail in safari and deleted the large email I sent in the from the sent folder and cleared the trash but this has still not solved my problem.
Does anyone have any clues that may help me? I just want to use mail again. Thanks.
-Spencer

I found this from the user GoldenShoes:
The problem appears to be in the calendar data you have in Mail, so if you should test that by removing the todos-info.plist file from Home/Library/Application Support/iCal and then restart Mail to see if the problem continues. If not, then you'd need to quit Mail, restore the todos-info-plist file, open iCal and copy all those ToDo items; then remove the todos-info.plist file again, restart iCal and paste the ToDo items back in and save it.
Then you can restart Mail and see if that solves your problem.
It worked for me... hope it helps you.

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