I think MAYBE they were having problems with the junk filter recently. I just logged into web panel and noticed that all of my custome entries to the whitelist and blacklist (across all of my domains) have been deleted. Ugh, manually re-entering all those whitelist addresses does not sound pleasant to me! I must do what I must do, I guess.
You may want to go check and see what is listed on your webpanel, and add them from there. I am going to add mine back tomorrow and see if they take.