When you have a partner, you inevitably sign up for memberships and accounts that equally affect both of you: a dual streaming subscription, or health insurance that covers you both. Annoyingly, many of these memberships only let you sign up with one email address. Instead of setting up a third email account, or making a new forwarding rule for every signup, here's a Gmail trick that you can set and forget.
It's one thing to know that your credit card offers insurance for travel mishaps like delayed baggage or airlines that suddenly shut down. It's another thing to know how to access those benefits when you're on the road.