I get an unreasonable amount of utility a few times a year out of http://mailaletter.com , which does exactly what it says on the tin. I mostly use it as an API to upgrade Word documents into Certified Mail Return Receipt Requested.
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Replying to @patio11
You may find http://lob.com to be interesting for this too. They have some distinct options like post cards, mailing checks, and address verification.
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Replying to @ScottSwezey
If I were doing it on a larger scale I'd probably use them, but the usage of API here is metaphorical.
8:41 PM - 27 Apr 2019
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