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There are quite a few e-mail address encoders. Some work differently than others so you should check out a few to see which is best for your use. Just do a google search for email address encoder, mailto encoder and the like and you should come up with a handful.
I've gotten away from email forms but I'm sure somebody else will tell you how to use it with Matt's script AND all the things you should do to secure the script from possible spammers.
The good thing is that (in your case), you define a list of email address in the config section of the perl file as:
and what you do on the actual HTML page (where the form lies) is just set the recipient to whichever number you want it ie recipient =1,2,3)
It's really great.