People will hold onto fundraising mail to donate at the end of the month when they write out checks to pay monthly bills. We see this in the “long legs” that many direct mail campaigns have. Email doesn’t have the same staying power—it’s easy to delete or scroll past, and folks aren’t likely to sort back through old emails to donate. The bulk of email donations are made within the first few hours, but direct mail sticks around, meaning it offers two points of connection: one when a donor first receives it, and again when they return their gift several days, weeks, or even months, later!