Implement Email Template System

[llinsss]

Description:
Create reusable email templates with variable substitution.

Tasks:

• Create template engine
• Design email templates
• Add template management
• Support multiple languages

Files to modify:

• backend/services/external/smtp.js

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[rosemary21]

@rosemary21 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

i’m interested in implementing reusable email templates with variable substitution because consistent and well-structured email communication is essential for user engagement, transactional clarity, and brand trust. A proper template engine makes the system more scalable, easier to maintain, and adaptable for future features like localization and dynamic content personalization.
I work on this project wave 1 and i believe i did a fantastic job

Relevant Experience

Email Systems & SMTP Integration

Integrated SMTP services for transactional and system emails.

Built modular email services that separate transport logic from template rendering.

Implemented retry and error handling mechanisms for email delivery failures.

Template Engines & Variable Substitution

Worked with templating systems such as Handlebars, EJS, and similar engines.

Designed dynamic templates with placeholder variables and conditional blocks.

Ensured safe variable interpolation to prevent injection vulnerabilities.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @rosemary21 to this issue.

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Congratulations, @rosemary21! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @rosemary21: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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This issue has been completed by @rosemary21 as part of the Stellar Wave Program's 2nd Wave 🥳

😎 @rosemary21: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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