I have heard about these scams. They either get your checking account number or have you write them a check which they cash. The check you deposit of course bounces sky high.

When did you play the lottery that you won?
Where is the rest of the money that you won?
If you got a final notice, where were the rest of the notices?
If the International Relief & Development is looking for donations (per their web site), why would they send your husband a check?

I think it's a scam too!