Abt putting your logo twice, BIG, on the env? The donor IS the hero. Not the charity. The hero stands in front. The charity is the backdrop.
The hero stands in front, taking (absorbing, thriving on) the applause. The charity is the curtain. Donor = actor. Way it SHOULD be, @ least in the donor's mind.
Are donors' minds as delicious as Girl Scout cookies?
Think of donor communications for their acoustics and body language as much as anything.