If you want to use the same Gmail address to sign up for two different accounts on a site, here’s a neat trick. At the end of your handle, append a plus sign and add a word — it’s recognised as a different address but goes to the same Gmail inbox. “For Gmail addresses, only the characters up until the first plus sign are used to determine where to send the email. For instance, emails sent to email@example.com and firstname.lastname@example.org will both go to email@example.com,”
I use it to sign up to new sites. When i joined trello for example, i used, firstname.lastname@example.org, setup a rule to route all marketing jazz and things related to trello into a folder. My inbox loves me.