Rules files (blacklist)

[Mike At Spy]

Is it possible to set a rule that cover the 'subject' line of an email
instead of the to or from?

If so, would the word 'subject' have to be in a particular format
(upper-case, etc).  Would I have to adjust anything in the MailScanner.conf
file - aside from telling it where to find the rules file?

I mean in the /etc/MailScanner/rules/ directory.

Thanks,

-Mike