I just went through the same thing for a business customer. A computer on
the network was infected that flooded the server. You might need to use
something like Microsoft Network Monitor 3.1 to track which computer or
computers it is coming from and remove it from the network See the link
below to information that may help about clearing the ques using the
aqadmcli.exe tool and identify the user account/accounts sending the email.
The server I was working on had 23,000 messages in a que for PayPal and
several other ques with hundreds. Hopefully the server itself is not