I always use the domain-name minus the top level for my token. So if my base email were "david@example.com", for "dropbox.com" it would be david+dropbox@example

I always use the domain-name minus the top level for my token. So if my base email were "david@example.com", for "dropbox.com" it would be david+dropbox@example.com. That makes it very easy to figure out all the emails I might have (since I'm essentially just remembering an very simple algorithm to generate them). Very often sites have sucky email validation that rejects "+" so I configured my system to allow . and _ to also work the same way. That way I can choose david.dropbox@example.com or david_dropbox@example.com if the + doesn't work.