Tales From the Crypt

Don’t forget to suppress
Suppression files are lists of people who you don’t want to get your prospect mailing. Besides the DMA Mail Preference file, you’ll also want to suppress your donor file.

But be careful when selecting names: Only select current donor names and lapsed donors who you intend to solicit during the campaign. Don’t suppress long-lapsed donors unless you plan to mail them, because they could come back to you through a prospect list.