Generating Disposable GMail
Read the official google blog here:
if your email address is firstname.lastname@example.org, you can actually use email@example.com, and it will send to your email address (address to firstname.lastname@example.org)
This allows you to differentiate at the point of receiving these emails, hence you can directly filter them to spam or another label or archive it straight away.
The more subtle way is to use dots instead. (e.g....