How we build, what we learn, what we ship.

PGP encryption explained: how public keys, keyservers, and the web of trust work, why it never went mainstream, plus a modern JOSE-based alternative to it.

End-to-end encrypted email means only the two endpoints hold the keys. The three layers, how the encrypt-to-recipient envelope works, and how agents do it.

Encrypted email for AI agents: opt-in end-to-end encryption with client-held keys, so only the two AgenticEmail inboxes in a thread can read the message.

Zero-knowledge email means the provider never holds your key, so it literally cannot read your mail. How zero-knowledge encryption differs from encryption at rest.

Working with the Zoho Mail API: OAuth 2.0 setup, accountId discovery, sending messages, reading folders, and the limits to know - plus when a purpose-built email API is simpler.

How the Postmark API works: server tokens, the /email endpoint, message streams, templates, inbound processing - and when Postmark is or isn't the right choice.

Everything about the Gmail API in one place: OAuth setup, scopes, sending, reading, push notifications, quotas, common errors - and when it's the wrong tool.

Use the Gmail API from Python: OAuth setup with google-api-python-client, sending, reading and parsing messages, attachments, and the pitfalls that bite in production.

A temp mail API creates disposable email inboxes from code - for OTP testing, signup QA, and agents. Working curl, TS, and Python examples.