The American Society for the Prevention of Cruelty to Animals (ASPCA), an animal welfare nonprofit based in New York City, created a best direct mail campaign for the holidays that leverages a letter format. This mail type offers plenty of real estate for sharing the story of what ASPCA does, it's from the President and CEO of the organization to have a more personal touch, and it also uses imagery to tell the story as well.
This nonprofit letter is a great example of how to use direct mail during the holidays.
Source: Who's Mailing What!
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