[Mimedefang] use strict

[Kevin A. McGrail]

John:

No problems here.  I switched to back before August of last year on the main 
server without issue.

Regards,
KAM

>     I was thinking of sticking 'use strict;' in my filter in order to
> make sure that it is written cleanly and is less likely to have bugs (I
> realise that 'use strict;' is not a panacea).  Is this likely to cause
> any problems with mimedefang.pl?