2026-07-28 · 1 min read
Designing idempotent sends with the PulsePigeon email API
How to use idempotency keys when sending transactional email so retries after a timeout never result in a duplicate message reaching a customer.
Blog
Notes on deliverability and email infrastructure.
We write about what we learn running our own mail transfer agents: warm-up, reputation, authentication, and the economics of email at scale.
2026-07-14 · 1 min read
Warming up a new sending domain without losing deliverability
A practical warm-up schedule for a new sending domain: volume ramps, engagement signals, and the authentication records to land in the inbox instead of spam.