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The folowing HTML code should do the job.
<form method="POST" action="mailto:you@emailadress.com">
<p>Please enter your email address:
<input type="text" name="T1" size="20"><input type="submit" value="send" name="submit"></p>
</form>
All you need to do is change you@youremailaddress to your real email address. The only draw back with using this method is that windows will prompt the user "you are sending information that is not secure do you wish to proceed"
I have used it on a few smaller sites in the past with no real problems. Belive it or not I once came across an online store accepting credit card details this way.