I built a system years ago for automatically expiring email addresses: https://grepular.com/Automatically_Expiring_Email_Addresses https://grepular.com/Automati

I built a system years ago for automatically expiring email addresses: https://grepular.com/Automatically_Expiring_Email_Addresses https://grepular.com/Automatically_Expiring_Email_Addresses You can email any address of the format "YY-MM-DD"@tmp.grepular.com and it will work, but only if the YY-MM-DD date is in the future. Ie, 2013-12-25@tmp.grepular.com will work from now until Christmas and will bounce after that date. It's really useful for signing up to services that I don't intend to use after that day, or for entering competitions etc. Competition draw is in a month? I'll pick an email address which expires in about 2 months and enter with that one.