[Exim] verify recipient exception in ACL

Hi,

I'd like to modify this ACL statement:

  accept  domains       = +local_domains
          endpass
          verify        = recipient

so that it verifies all recipients EXCEPT those with local_parts
beginning "mike-". I've tried loads of different things but just end up
either denying all recipients or accepting all recipients. I'm sure I'm
missing something obvious so would be very grateful for any assistance.

Thanks in advance,

--
Mike Zanker
Northampton, UK
PGP Public Key from pgp@???