I requested the same feature some time ago and see it's been requested multiple times over the past 3+ years and has a relatively high number of "votes" from users. It's also been given a "Great Idea" nod from a moderator, yet it has not been added. It seems like an easy fix, unless you consider we pay by the # of addresses we send to, which makes such a clean-up feature costly to CC. Any thing anyone can do to prompt action would sure benefit users.
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