The best thing about sending via facsimile (to a CA) they are so used to getting things CMRRR, they forget that facsimiles are equally trackable via the confirmation page. The CRAs at least from my own personal experience remember that, and don't violate as easily from a fax, but the fax gets there immediately.
I faxed and sent a letter - just to make sure. I disputed a $100 item with Experian online last month and was just notified that was deleted. The new letters are for four items I sent PTD letters on and received no response.
