Welcome email implementation guide: triggers, sequences, and deliverability

Welcome emails are the easiest win in your transactional email stack, and somehow still the most common place things go quietly wrong. Wrong timing, broken merge tags, missing authentication, or a domain reputation you didn’t know was tanking. This guide covers all of it: how to structure the sequence, how to trigger it reliably via API, and how to measure whether it’s actually working. Table of contents 01 What is a welcome email, and why does it matter? 02 Single welcome email vs….