An approach we have taken with good success has been a Value Based Communications workshop, where all of the correspondence and communications are listed — and a team of the “recipients” of the various pieces meets to discuss how often they need each piece; the appropriate medium (email, mail, meeting, web-posting, etc.); and the appropriate frequency for each.
The workshop combines the value-add / non-value add review, with the ICC concept others have posted here.
As an output of the workshop, you can recommend consolidations and reductions in the total correspondence volume — and distribute that recommendation for sign-off to the total affected audience.
Good luck, and please let me know if you have additional questions.
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