Letters of acknowledgement in the least would be great (not so much direct mail, as that is an entirely different marketing service), as many donor CRMs do this. For those donors who give online through Give Butter, but where we would still like to hit print on a formal acknowledgement letter that fits to our own template. Or when we manually add check transactions, many donors who mail in a check expect a mailed letter acknowledgement back.

This is a whole 'nother ball of wax. Who is going to spec the paper and piece size? pay for the postage? whose indicia? which endorsement?