Implement sub-addressing
Would like to be able to have some kind of sub-addressing separator
https://en.wikipedia.org/wiki/Email_address#Sub-addressing
This would be helpful for filtering spam and identifying how the spam got to my inbox. Really filtering in general.
For example, using + as a separator:
If your screen name was "ExampleScreenName", your regular email address might be ExampleScreenName@aol.com
If you need to provide your email address somewhere you can instead use ExampleScreenName+someonlinestore@aol.com
Now you can filter by the send to address. If you start receiving spam from a certain subaddress, you have a better idea of who might have been compromised or gave away your address.