SoFi Technologies, Inc. is an American online personal finance company and online bank. Based in San Francisco, SoFi provides financial products including student and auto loan refinancing, mortgages, personal loans, credit card, investing, and banking through both mobile app and desktop.
SoFi uses direct mail letters to offer home loans to current and prospective customers. This letter is an excellent example of using multiple calls-to-action to engage the reader.
Source: Who's Mailing What!

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

In this Best Direct Mail Campaign example, VCA Animal Hospital pairs direct mail and email to bring pets in for vaccinations.

BaubleBar uses a custom promo code to be able to track and attribute the results of its direct mail campaign. See it and other examples.