During my divorce, my H was adamant that I was mailing tax information, etc., to the wrong address. He also insisted that NO ONE read his mail except himself.
So I sent the next letter certified. Yep, the OW intercepted it and signed for it, using her real name!! My lawyer used the signed card as evidence in court .... PLUS my H was furious to learn that OW was interceping his mail and lying about it.
I strongly support your decision to send all future correspondence by registered or certified mail. Be sure and keep all receipts.
