How email actually works, for developers

How transactional email actually works: from API call to inbox

What happens between your API call and the inbox: queuing, DKIM signing, SMTP delivery, SPF and DMARC checks, bounces and events.

SMTP vs email API: which should developers use?

SMTP and email APIs compared for application developers: how each works, errors, speed, firewalls, delivery events and when SMTP is still the right choice.

How to handle email bounces in your application

Hard bounces, soft bounces and complaints, the SMTP codes behind them, what to store, and suppression lists that stay accurate.

How email webhooks work (and how to handle them safely)

What email webhooks carry, how signature verification works, and how to build an endpoint that is fast, idempotent and misses nothing.

The complete guide to transactional email for SaaS applications

What a SaaS team needs to get transactional email right: which emails to send, domain setup, architecture, deliverability and monitoring.

SPF vs DKIM vs DMARC: a developer's guide (with records you can copy)

What SPF, DKIM and DMARC do, how they work together, and the exact DNS records to publish so your email is delivered.

Transactional vs marketing email: the difference and why it matters

What counts as transactional email, what counts as marketing, and how to send each so both reach the inbox.

Email deliverability checklist for developers (2026)

Fourteen checks that decide whether your email reaches the inbox - DNS, content, lists and monitoring.

How to receive and parse inbound email in your app

The three ways to receive email in an application - IMAP polling, running a mail server, or an inbound email API - and how to trust what arrives.

What is an email API? How it works and when to use one

An email API explained: how it differs from SMTP, what it handles for you, and how to choose one.