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Email Sending Implementation Guide

Help me implement email sending in my application.

Use case: [TRANSACTIONAL / MARKETING / NOTIFICATIONS / ALL]
Tech stack: [NODE / PYTHON / OTHER]
Volume: [LOW / MEDIUM / HIGH]
Provider preference: [SENDGRID / RESEND / AWS SES / POSTMARK / NONE YET]

Provide:
1. **Provider Selection**: Best email provider for my use case and budget
2. **Setup & Configuration**: API keys, domain verification, DNS records
3. **Sending Code**: Basic send email function with error handling
4. **HTML Templates**: Creating responsive email templates
5. **Template Variables**: Dynamic content insertion in templates
6. **Transactional Emails**: Welcome, reset password, order confirmation patterns
7. **Queue Management**: Handling email queues for reliable delivery
8. **Deliverability**: SPF, DKIM, DMARC — getting emails to the inbox
9. **Testing**: How to test emails in development without sending real ones
10. **Monitoring**: Tracking delivery, opens, bounces, and complaints
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