Getting Visitor's Email Address

i realize that with this thread subject, i will probably get the
"SPAMMER!!" flames, but, i'm not necessarily looking to scrape an
address, more or less, just some suggestions. i have a flash site that
has a "email" button. this opens another window which is just html
forms where the user inputs their message, clicks "send" and off it
goes -- we've all seen these many times. i then use phpmailer to send
their email to me.

i like the idea of having this because i don't have to display my email
on my page and it's a more continuous approach then having the user
launch a mail client. what i'm trying to avoid is to have users send
me bogus emails from bogus addresses. my first thought was that i
could capture their mail address for my "from" field and use the email
address they supplied on the html form as the "reply" field. that way,
i can at least eyeball their supplied address against their real
address and my replies would not bother their real address, only the
one they supply. yes, i realize this isn't by any means airtight, but
i can at least filter out any obvious ones. so, is this possible? if
not, should i just grab their IP addresses instead (i'm not sure how to
do that either)? better ways entirely of doing this? thanks.

heath

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