Sendmail Access related question

[brichter]

Please excuse this if this is not the proper list for this question.. It
is related to Mailscanner in the sense that I learned on the Mailscanner
WIKI how to do this - block all traffic to non valid AD Echange addresses.
(At the front end, instead of letting it through then Exchange has to deal
with the NDR's)

We have several mail scanner/Spam Assassin/Sendmail servers that download
all SMTP aliases from a VBS that runs
on our Active Directory servers.  These SMTP addresses are then allowed to
relay through the sendmail access file.
(so only properly addressed emails make it into our company, it's amazing
up to 20,000 per day are spelled wrong!(denied))

Example:

To: test.com REJECT Invalid Users Name.

To:test at test.com RELAY
To:test2 at test.com RELAY

This works great accept I am noticing a few stray messages still getting
by sendmail. (if someone uses Bang notation 
I think it's called) - test!@test.com will get through.

using To:!@test.com REJECT does not catch them
or To:test at test.com REJECT

How can I block this in the access file?

Thanks

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