Travelers is an American insurance company.
Travelers uses direct mail letters to acquire new customers for its auto insurance offering. Travelers featured a customer testimonial to back up its savings promise.
Source: Comperemedia

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UnitedHealthcare Hearing uses a direct mail self-mailer to reach potential patients on their journey to better hearing.

Girl Scouts uses a direct mail postcard campaign to acquire new members in this best direct mail non-profit campaign.

In this Best Direct Mail Marketing example, Lewis & Clark College does an excellent job using personalization to gain a prospective student's interest.