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by imroot 3212 days ago
CertifiedMailLabels.com is what I use -- They send it certified mail, keep a copy of the letter (so there is no disputing what the contents of the letter are) and give you effectively indisputable proof of delivery -- they give you a proof of mailing that they sent the letter that is in .pdf form, and then they provide a .pdf receipt that is your return mail copy.

I've had to use it in the past for creditors who don't have a clue.