Mailtrap Email Integration Patterns for adding transactional email sending to an application using Mailtrap's Email API and Sandbox, covering authentication, environment separation, and common delivery pitfalls. When to Activate - Implementing a "send email" feature (signup confirmation, password reset, notifications, receipts) - Debugging why emails aren't arriving in dev/staging - Setting up a project's first email-sending integration - Reviewing code that calls an email API directly without sandbox separation Core Concepts Sandbox vs. Production separation. Mailtrap provides a Sandbox API…