Thanks for all the responses.  I really appreciate them.

> Message size. 

Mail is not being restricted by message size.

> System overload.

Server almost always has a load under 1.00, though at night numerous scripts
run bringing the server load to ~1.50-2.00 at times.

> Possibly DNS timeouts. Do you have a caching nameserver set up locally, 

No local caching nameserver

> System tasks, like automatic restart of spamd after running sa_update. 

Not sure about this.  How would I know?  I run Webmin/Virtualmin and
spamassasin came installed with it.

> What command-line arguments are being used with spamc?

Don't think there are any.

> Check your MTA log (e.g. /var/spool/maillog) for the time around 

What to look for?  I checked and nothing out of the ordinary on each of
these messages.

I have also read of someone having messages that don't get scanned by SA to
get sent back to SA to get rechecked.  How would I go about doing this?  I'm
not terribly adept at knowing all the terms so any step by step help is
appreciated.
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