Resolving Spam Flagging Issues

Email Developer - Fix Spam Filtering Issue

Job Description: We need an experienced email developer to help us fix spam filtering issues. Our verification emails are being flagged as spam by Gmail, showing the warning "Why was this message marked as Spam?" Our NestJS backend uses HTML email templates with i18n support.

Current Problem:

Gmail is flagging our verification emails as spam
Users see yellow warning banner: "Why was this message marked as Spam?"
Affecting user account verification process
Current Setup:

NestJS backend with TypeScript
Uses AWS SES for email delivery
Supports multiple languages
Templates use placeholder system: [username], [greeting], etc.
Requirements:

Experience with email deliverability and spam prevention
Knowledge of email authentication (SPF, DKIM, DMARC)
Understanding of Gmail spam filter triggers
Experience with HTML email best practices
Ability to optimize email content for better deliverability
Additional Notes:

Focus on content optimization and authentication, not complete redesign
Please include in your proposal:

Experience with email deliverability issues
Examples of fixing Gmail spam filtering
Estimated approach to solving the problem