How to investigate Postmark evidence
Transactional delivery problems often involve both provider configuration and application behavior. Mailybox combines public sender evidence with message forensics and failure simulation so the investigation is not limited to DNS.
Signals worth checking
- Sender authorization fingerprints
- DKIM signing identity
- Bounce and SMTP transcript
- Webhook failure behavior
- Template regression risk
Diagnostic path
- Validate the message identity with a real delivered header.
- Keep provider failure evidence and application retry behavior in the same incident view.
- Regression-test transactional templates before release.
- Use deterministic failure fixtures to verify retry and hard-bounce handling.
Questions this hub can answer
- Which identity signed this transactional message?
- Can the application distinguish retryable and permanent failures?
- Did a template release change external domains or tracking?
- Is the provider visible in the sender inventory?