addrcheck: Check incoming mail for valid mailbox names.

[newsgate] / .userv / rc

### userv configuration for newsgate

if ( glob calling-user qmaild
   & ( glob service addrcheck:newsgate-default
     | glob service addrcheck:newsgate-post-default
     )
   )
        no-suppress-args
        execute bin/addrcheck t
elif ( glob calling-user qmaild
     & glob service addrcheck:newsgate-mail-default
     )
        no-suppress-args
        execute bin/addrcheck g
fi