Stuff4Toys:
Without seeing your configuration, double check in the admin under Configuration/E Mail Options and make sure that you have everything set up correctly. Check all the email address and make sure that they are correct.
If you are using a hotmail, yahoo or Gmail or some other public eMail address make sure that you are not blocking email from your site. Sometimes Junk Mail filters need to be adjusted.
JOhn ><>
ok, i checked the Configuration/E Mail Options --- everything is set up correctly and as it was when it was working.
all of my notify email addresses are part of my domain - no hotmail, gmail, yahoo or any other public address accounts are used.
could be as Varisha suggests below...i'll check with my host to make sure my mail server was not blacklisted.