clipped from: meltmail.com   
Meltmail

3h 6h 12h 24h

Enter your e-mail address in the text field and choose how long your Melt Mail foward-address should be available -- it's the melting point.
After hitting the "create"-button, a unique Meltmail is created which forwards every incoming mail to your e-mail acccount.

After the melting point is reached, we delete your real e-mail address from our database and also the Meltmail won't be available anymore.
So, we only store your e-mail address during the period of time you defined with the melting point.