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Practical guides for whatever you’re working on next.
Developer tools
6 articlesMX Records for Receiving Email: Set Up a Subdomain Without Breaking Existing Mail
Keep your team’s mailbox working while your application receives replies on its own subdomain. A practical guide to MX records, DNS host fields and end-to-end receiving checks.
How to Test Signup and Password-Reset Emails Before Launch
A sent message is only the beginning. Follow this practical checklist to test email verification, password resets and the failures your users might encounter.
How to test email verification codes with Playwright and InboxIt
Build a signup test that waits for a new email, reads its verification code and checks the account is verified. Keep your existing sending provider.
InboxIt vs Resend, Postmark and Mailgun: which email API fits your app?
Compare InboxIt, Resend, Postmark and Mailgun for sending, receiving and testing app email. Choose by workflow, not just send volume.
How to test signup and password-reset emails with a temporary inbox
A step-by-step guide to testing outgoing delivery, incoming mail, verification codes and reset links without mixing up your test results.
Email API key security: scopes, storage and rotation for apps and agents
Create and manage InboxIt API keys safely: choose permissions, keep secrets off the frontend, rotate credentials and troubleshoot access errors.