[Mimedefang] Mimedefang to strip HTML via sieve

[Kris Deugau]

@lbutlr wrote:
> Does anyone have a sieve setup that removes html enclosures (or converts them to plain text, even better)? I want to do this for specific mails, not globally for the server, so I think sieve is the way to go here rather than a milter.

To my understanding Sieve deliberately restricts calling arbitrary 
external programs.  I think there's a loophole if you build a whole 
Sieve plugin to wrap the program, but digging in to that is still on my 
"need to read more" list.

-kgd