Test Email Flows in CI With Disposable Mailboxes

Short summary

Testing email-dependent features in CI traditionally required shared Gmail catch-alls with OAuth and label gymnastics, causing flakiness when parallel tests collided. Nylas's disposable mailbox approach assigns each test a unique UUID-suffixed address under a wildcard pattern, eliminating shared inbox contention entirely. The post walks through Playwright fixtures, CLI setup, message polling with retry logic, regex/HTML parsing for extraction, and GitHub Actions integration—with code examples for signup verification and OTP flows.

• •Disposable mailbox service eliminates shared inbox race conditions in email-dependent E2E tests
• •Each test gets a UUID-suffixed address; Playwright fixtures handle polling and message extraction
• •Complete CI setup with GitHub Actions, parallel-safe by construction

Generated with AI, which can make mistakes.