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They get a free month of Proton Mail Plus Make sure they use your referral link when they sign up! 3. If they subscribe after their free trial, you’ll get Proton Mail credits Once their free trial is over, you’ll get: $5 if they subscribe for a month $15 if they subscribe for 12 months or longer You can refer as many people as you like, but the maximum referral credit you can earn is $90.