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How to Test Receipt Templates — Custom-Domain Transactional Email API Ownership

A beginner comparing MailerSend with Amazon SES or another simple transactional email API should not pick the cheapest option for welcome emails until custom-domain authentication and suppression-list…

  • Custom-domain authentication required for transactional email APIs
  • Receipt templates must include order reference, payment state, amount, and support path
  • Testing focuses on final customer artifact and state transitions

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