Detecting ASCII art in emails

Hello.

I am writing a program to detect ASCII art in email messages.

I am currently designing the heuristics, or to put it another way,
I'm trying to work out how you can identify the presence of ASCII art.

I thought I'd write and ask you folks who do lots of it what you
think the determining features are.

My observations so far:

There's lots of spaces, often at the start of a line.
Spaces are used differently to those in text.
There are few tab characters used.
Many non-alphanumeric characters are used.


If you can add any more features, such as the alphabetic characters
that you use a lot of, then I'd be most grateful.

(The program will be in Perl, but any code or pseudocode will also
be warmly received.)

Many thanks,
Ian.

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