How to Add Newsletter Opt-In to Rails 8 Signup Using Vault and Courrier

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A new tutorial demonstrates how to integrate newsletter subscriptions into a Rails 8 signup flow using two Ruby gems: Rails Vault and Rails Courrier. Developers add a simple opt-in checkbox to the signup form, storing the user's preference via Rails Vault, which manages settings and preferences for ActiveRecord models. Rails Courrier then handles API-powered email delivery, supporting providers such as Mailgun, Postmark, Resend, and Buttondown. The guide walks through gem installation, database migration, model updates, and initializer configuration to wire the subscription logic together. All accompanying code is available in the Rails 8 Authentication repository for reference.

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