Proton mail coupon: 1st month of Mail Plus at 1$/€

Here's the coupon: MAILPLUSINTROACQ

Only applies for the first month of Mail Plus, for the monthly subscription

Got this coupon from their Brave marketing campaign

Here is the link for the official campaign: https://proton.me/l/mail-intro-offer (only works if you create a new account, but you can use the coupon I provided and I believe it should work for existing accounts)