I was just curious about what causes an email to get stuck in the Queue. The most common one I see is due to a full mailbox. But others just seem random. Today, I've had two emails with multiple recipients get stuck in the Queue. One went through went I forced it (why didn't it go through by itself?). The other won't go through, appearantly, because of one bad email address (host lookup did not complete). Why won't it send the rest of the recipients through? Any advise?