[Exim] Clever spammer :(

I use various anti spam messages but this spammer took the biscuit:
- -oilandgasremoval@???

Any attempt by any of my antispam software (tmda for example) which
tries to confirm or deny the existamce of the email address fails
because exim sees the -oiland.... as a command line option.

So does anyone know how I would prevent these coming in.

See Ya, Sean

- --
  Sean Rima                                http://www.tcob1.net
  Linux User:      231986          Jabber:   tcobone@???
  THE VIEWS EXPRESSED HERE ARE NOT NECESSARILY THOSE OF MY WIFE.