Sendmail question

[kj]

I should know this but I'm drawing a blank, and google is only finding 
the things I'm not looking for.

How do I get sendmail to forget the MX lookups it's done for mail that 
are already in the queue, and check them again?  I have a client who 
screwed up with their DNS, so there's a host of mail in the queue 
destined to a non-existent MX.

Thanks

--kj


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