Glossary
The words email runs on.
Short, opinionated definitions — each one paired with where Calder implements it. No filler entries.
Email APIAn HTTP interface for sending email from code.SMTPThe 40-year-old protocol that moves email between servers.Transactional emailMail the recipient triggered: OTPs, receipts, resets, alerts.DeliverabilityThe discipline of reaching inboxes instead of spam folders.WebhookAn HTTP callback your provider fires when something happens.IdempotencySame request twice, same effect once.BounceA message the recipient server refused.ComplaintA recipient marking mail as spam.Suppression listAddresses you must never email again.Email reputationThe score mailbox providers keep on your sending identity.
New terms are added only when we have something original to say about them.