Welcome Email Deliverability Explained: 4 Custom-Domain DKIM Controls for APIs
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Short answer: Treat password-reset delivery as a four-control runbook: verify the branded sending domain before launch, keep the From address stable, rotate DKIM deliberately, and review bounce and complaint events after every release. Delivery reliability is the deciding constraint. A beautifully rendered reset PDF is worthless if the message is rejected, delayed past its short expiry, or sent twice during a retry. Keep PDF generation and transactional email behind a stable capability contract