Disclosure: PulsePigeon publishes this guide and is one of the products named. Developer experience is measurable, so verify every claim against the current product.
Time a clean integration, deliberately trigger validation and authentication failures, simulate a timeout, verify a webhook signature, and trace one message from acceptance to a terminal delivery event.
Check whether an SDK is actually installable from a public registry, which versions and runtimes it supports, and whether its methods match the live HTTP API. Source code or a generated package is not evidence of a public release.
For a PulsePigeon proof, start with the REST request example and developer documentation. Persist the logical event ID before sending, repeat an identical request with its Idempotency-Key, and confirm the accepted response's id against subsequent delivery events. Use the error reference to classify failures rather than assuming every failed request can be retried.
Compare Resend, Mailgun, SendGrid, Amazon SES, and PulsePigeon with the same acceptance, error, retry, event, and clean-install tests. Recheck current vendor documentation before committing engineering time.