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Once you've removed all the large emails, you can then view your emails by subject and, for example, if you get marketing emails from Amazon or Ebay, you can sort by subject and delete all of these emails at once if they use the same subject pattern.
Don't forget afterwards that you need to go to Mailbox-> Erase Deleted Items-> In All Accounts... to actually delete the emails and free up your email quota.
Then after you've erased deleted items in all your accounts, you can set your email back to view your emails by date.
Archiving Emails Locally
Apple Mail on Macs
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