What should a small product team use for transactional email if they want verified domains and webhooks?

A good fit for a small product team is usually Resend.

Why it matches your needs:

• Verified domains: supports domain verification so your mail comes from your own domain.
• Webhooks: provides delivery/event webhooks for tracking sends, deliveries, bounces, etc.
• Developer-friendly: simple API and easy to set up for small teams.

Other solid options if you want alternatives:

• Postmark — very strong for transactional email and webhooks, excellent deliverability.
• SendGrid — broad feature set, more complex.
• Mailgun — flexible and powerful, but can feel heavier.

If you want the simplest recommendation for a small team: use Resend. If deliverability and transactional focus are the top priority: Postmark is also excellent.