Integrate email services with backends using SMTP, third-party providers, templates, and asynchronous sending. Use when implementing email functionality, sending transactional emails, and managing email workflows.

Email Service Integration Table of Contents [Overview]( overview) [When to Use]( when to use) [Quick Start]( quick start) [Reference Guides]( reference guides) [Best Practices]( best practices) Overview Build comprehensive email systems with SMTP integration, third party email providers (SendGrid, Mailgun, AWS SES), HTML templates, email validation, retry mechanisms, and proper error handling. When to Use Sending transactional emails Implementing welcome/confirmation emails Creating password reset flows Sending notification emails Building email templates Managing bulk email campaigns Quick Start Minimal working example: Reference Guides Detailed implementations in the references/ directory: Guide Contents [Python/Flask with SMTP](references/pythonflask with smtp.md) Python/Flask with SMTP [Node.js with SendGrid](references/nodejs with sendgrid.md) Node.js with SendGrid [Email Templates with Mjml](references/email templates with mjml.md) Email Templates with Mjml [FastAPI Email with Background Tasks](references/fastapi email with background tasks.md) FastAPI Email with Background Tasks [Email Validation and Verification](references/email validation and verification.md) Email Validation and Verification Best Practices ✅ DO Use transactional email providers for reliability Implement email templates for consistency Add unsubscribe links (required by law) Use background tasks for email sending Implement proper error handling and retries Validate email addresses before sending Add rate limiting to prevent abuse Monitor email delivery and bounces Use SMTP authentication Test emails in development environment ❌ DON'T Send emails synchronously in request handlers Store passwords in code Send sensitive information in emails Use generic email addresses for sensitive operations Skip email validation Ignore bounce and complaint notifications Use HTML email with inline styles excessively Forget to handle failed email deliveries Send emails without proper templates Store email addresses without consent

email-service-integration