Using TempMailer for email integration testing

The problem with ephemeral test inboxes

Traditional temp email services are designed for one-shot use. They expire in minutes. This creates real problems in development environments:

• Your CI pipeline may take longer than the inbox TTL
• You can't rerun a test against the same address without reconfiguring
• Multi-step email flows (sign up → verify → password reset) can't be tested across sessions
• Debugging email issues requires generating fresh addresses each time

TempMailer as a stable test inbox

TempMailer's persistent inbox solves all of these problems. Set up once, reuse across every test run:

• Save your TempMailer address as TEST_EMAIL in your environment config
• Every test run hits the same inbox - no regeneration needed
• Emails persist between runs, giving you a history for debugging
• Private by default - unlike Mailinator, no one else can read your test emails

Comparison with other testing tools

vs Mailinator: Mailinator has a more powerful API for high-volume automated testing. But all Mailinator inboxes are public. TempMailer is better for any scenario involving real credentials. vs real test accounts: Maintaining a real email account for testing requires credentials management, cleanup, and ongoing maintenance. TempMailer requires nothing. vs Guerrilla Mail: 60-minute expiry breaks anything beyond a single short test session.