Testing Transactional Email Delivery
Transactional email includes receipts, alerts, invitations and service notifications. Reliable delivery depends on message quality, domain authentication and sensible retry behavior—not simply calling a send API.
Validate message content
Check that the subject is specific, the sender is recognisable and the plain-text version remains useful. Links should use the organisation’s trusted domain and explain the result of clicking. Keep essential information visible without downloading remote images.
Authenticate the sending domain
Production senders should publish appropriate SPF, DKIM and DMARC records and monitor authentication results. These controls do not guarantee inbox placement, but they help receiving systems evaluate whether mail is authorised and whether the visible From domain aligns.
Test delivery states
Exercise successful delivery, temporary deferral, permanent rejection, suppression and provider timeout paths. Ensure retries have limits and use backoff. A product should surface delivery failures to operators without repeatedly sending duplicate customer messages.
Observe without leaking data
Log provider identifiers and high-level delivery states, but avoid logging full message bodies or sensitive tokens. Set retention limits for operational logs and restrict access. Use synthetic recipients in staging and approved seed accounts for production monitoring.
Quick checklist
- Provide useful plain text
- Configure SPF, DKIM and DMARC
- Handle deferrals and bounces
- Keep secrets out of logs
Remember: Mailvator inboxes are public and temporary. Never use them for confidential information, financial services or long-term account recovery.