You can significantly lower the amount of space your rules take by using the Incoming Mail Organizer. It moves incoming emails into folders that you designate. Similar to our Sent Items Organizer, you can have the add-in automatically move the email to folders based on who it's From (or To), keywords in the subject or body of the email, or you can have it ask you each time an email comes in (that it doesn't know how to handle).
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