Mail App Sending Packets, hogging network.

Hello.
Within the past day my home wireless network began running very slowly. After resetting the wireless router and airport, the problem persisted.
By chance I closed the Mail app and the network speed went back to normal. I've since figured out that when the mail app is open, the number of packets sent from my computer spikes and slows my network to a crawl. I've tried restoring the Maill app from time machine but it is still causing the problem.
Any insight about this problem would be much appreciated. Thanks

I have it set up with Gmail as an IMAP account. And Until yesterday, it had done the same thing, only using the network when the app first started. However, at some point yesterday it began constantly hogging the network and it did it consistently for a full day and half until a few hours ago when I discovered that the mail app was actually the problem and closed it.

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