This year, however, I need to write a few letters. There were some huge donations last year (compared to our average donation) that honestly, in my mind, require a letter to let the donor know how much we valued the donation last year and how much we would value it again this year. I think this is good donor-relations and it makes sense to me.
But what about you more experienced fundraisers out there? Do you use a mixed email/letter campaign or one or the other exclusively?