How to check form -> email

I have a web form, where the user has the possibility of entering his/her email-adress. I know this isn't the best way to do things, unless I have a validation present - so, how do I implement that?

I understand the concept of validating, and I have already a validation code present in my form (the form does not get sent unless you type in the code - basic stuff)

But how do I validate that there has only been _one_ emailadress typed in the field? Or none, for that matter - the field isn't required. And, of course, I'd also like to be able to rule out cases where people try to add \nBcc or the like.

Anyone have any pointers?

--
mvh
Ørjan Langbakk
http://www.bergenpchjelp.no
http://www.cubic-design.net
.

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