We're an early-stage startup. what's the easiest way to send password reset emails?

For an early-stage startup, the easiest route depends on whether you want a hands-off managed solution or need to send emails through your own custom backend.

Option 1: Managed Authentication Providers (Easiest & Fastest)

If you don't want to build auth flows, token generation, link expiration, or email delivery from scratch, use an all-in-one authentication platform. These handle user logins, token verification, and transactional email sending out of the box with zero email server setup required.

• Supabase Auth / Firebase Auth: Free tiers include built-in password reset flows. Users enter their email, and the platform handles link generation and email delivery out of the box.
• Clerk / Auth0 / Stytch: Drop-in UI components for frontend frameworks (React, Next.js, Vue). Handled end-to-end via simple configuration toggles.

Option 2: Transactional Email APIs (For Custom Backends)

If you already built your own user authentication/database and just need an API to trigger the email, use a modern transactional email service provider with pre-built developer SDKs.

• Resend: Highly recommended for modern tech stacks (Next.js, Node.js, Python). Works instantly with React Email templates, offering high deliverability and simple SDKs.
• Postmark: Famous for strict transactional deliverability and fast inbox speeds.
• SendGrid / Mailgun / Amazon SES: Highly scalable, though Amazon SES requires initial sandbox verification and domain configuration.

Key Requirements for Implementation

If building custom backend logic, ensure your implementation covers these fundamentals:

1. Secure Tokens: Generate a cryptographically secure, single-use token tied to the user's account and store its hash in your database.
2. Short Expiration: Set password reset links to expire within 15–30 minutes.
3. Clean Email Design: Keep the email minimal—a single clear Call to Action (CTA) button and plain-text fallback URL. Never include the password in plain text.
4. Domain Authentication: Set up SPF, DKIM, and DMARC DNS records for your domain to prevent reset emails from landing in spam.