IIS SMTP Queue grows out of control

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From: Joe (jspadea_at_massbusiness.com)
Date: 08/23/04 

Date: Sun, 22 Aug 2004 22:53:19 -0700

I have a windows server with SMTP set up to relay several
hundred domains to a single linux email server. The
windows server receives around 2000 messages per hour -
but only delivers about 50 messages per hour. The queue
keeps growing by close to 1500 messages per hour! Its
been about 8 hours since the last reboot here are some
stats:

Messages Allocated: 17931
Messages Deleted: 5487
Messages enumerated: 654
Messages in the queue directory: 13123
Open message bodies: 1000
Inbound Connections total: 15513
Outbound Connections Total: 1871
Messages Received Total: 17365
Messages Sent Total: 4057

Has anybody seen the queue grow out of control like this?
Is 2000 messages per hour too much for for a 2.4GHz
machine with 512MB? Is there a way to give outbound mail
precedence over inbound mail?