[qmailtoaster] messages stuck in the queue

[Steve Ingraham]

I am seeing a large number of messages stuck in the queue everyday.  Each morning I am seeing over 500 messages in the queue.  With very few exceptions they all are spam messages that the postmaster account has stopped delivery on because the spam message is trying to deliver to an account that does not exist in our domain.  What is directing mail to go to the queue?  Where are the settings for this?  What can I do to stop these messages from going to the queue?  I am currently going into the qmail queue and deleting all the messages that are spam and leaving any legitimate messages in the queue which then get delivered once the spam messages are deleted.  Is there something else I should be doing to keep this spam from collecting in the queue?   Thanks in advance for any assistance, Steve Ingraham