Firefox Relay makes it easy to create email masks that forward to your true inbox.
Firefox Relay helps you protect your real email address — the one most closely tied to your online identity. It lets you generate unique, random aliases you can use to sign up for accounts, apps, or newsletters, and forwards messages to your real address. If you find that an account is sending unwanted email or spam, you can block the alias and it will stop sending email to your inbox. Once you no longer want an account, you can delete the alias.