If you had a long lost relative that died leaving you money you would be notified by certified mail that you would have to sign for. Even when my parents died, (5 miles from me and we were really close), all official, legal correspondence was done this way. It was on the attorney's letterhead with a real stamp not some bulk mailing thing. Anything other than that is a SCAM. Delete it immediately and don't send them ANY PERSONAL information!!!
A friend's father passed away and her mother advertized his electic chair to sell it. She was contacted by someone in Canada that sent her a money order from a bank in Texas but asked her to hold it until they could come to Illinois and pick up the chair. Several weeks went by and they called to say that their mother had passed and they no longer needed the chair. They told her to go ahead, cash the money order, keep $500 for her trouble then get a new money order for the remainder of the money and send it back to them(p.o. box). My friend told her mom not to do it. So they took the MO to the bank, told them what had happened, and asked the bank to check it out. Guess what? It was a total scam. The bank notified the authorities but I don't think they ever caught the people. It's like we've been told all our lives: If it sounds too good to be true, it is.