Practical guides on private inboxes, agent-friendly email, verification testing, and infrastructure that stays out of your way.
Each collection groups guides around a concrete workflow rather than a generic tag.
The Relay Chrome extension puts a disposable inbox beside your tab: generate an address, paste it into signup forms, read verification mail, and copy an OTP or magic link when the message is unambiguous.
Learn when a custom mail domain improves email testing, how DNS verification fits in, and which isolation and security practices teams need.
Choose the right Relay interface for interactive verification, automated test suites, debugging, and agent workflows with a practical comparison.
Design email API clients with bounded retries, backoff, idempotency, pagination, and useful errors instead of request storms and hidden failures.
Create a practical data policy for email tests that protects OTPs, links, message bodies, inbox credentials, and CI artifacts.
Understand where SMTP ends and inbox testing begins, how envelope recipients work, and how to diagnose delivery failures without guessing.
Magic-link tests fail when they click the first URL in a message. Extract one candidate, validate the host, and open it in an isolated browser context.
CI email tests fail on shared inboxes, immortal sleeps, and OTPs printed to public logs. Treat each runner as its own mail boundary with hard deadlines.
Compare polling and webhooks for email automation, including latency, retries, idempotency, observability, cost, and implementation complexity.
Connect an AI agent to email without treating inbox content as instructions. Covers MCP tools, authorization, OTPs, links, and guardrails.