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How to Send Transactional Email from a Verified Domain via API or SMTP

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Transactional emails such as password resets, login codes, and receipts require a dedicated delivery setup using a domain you control. Proper configuration involves adding DNS records — SPF, DKIM, and DMARC — to authenticate messages and instruct receiving servers on handling them. Developers can choose between an API, suitable for apps already making HTTPS requests, or SMTP, which integrates with frameworks that natively support it; both methods require TLS and secure key storage. Delivery tracking should be implemented using webhooks to monitor accepted, delivered, bounced, and complained messages, with permanent bounces removed from future sends. Best practices include storing credentials in environment variables, using separate keys per application, and starting with low sending volumes before scaling up.

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How to Send Transactional Email from a Verified Domain via API or SMTP · ShortSingh