A practical evaluation framework for choosing a transactional email provider — the criteria that matter in production, how to test them before committing, and the costs that only appear later.
Timing, subject lines, content structure, authentication and operations — the practices that decide whether your transactional email works or quietly fails.
Why transactional email lands in spam, how mailbox providers actually score you, and the authentication, reputation and hygiene work that keeps critical email in the inbox.
Consent, infrastructure, sender reputation and legal obligations all change depending on which one you are sending — and the line is thinner than most teams think.
What a transactional email is, how it differs from marketing email, the 15 most common types, and how sending actually works — from API call to inbox.