feat: Migrate email service from Nodemailer to Resend #1247

[100NikhilBro]

🔧 Resend Email Service Migration

Resolves: #1247

---

📝 Summary

This pull request completes the migration of our email service from Nodemailer to Resend.
This change addresses deliverability and maintenance concerns discussed in issue #1247 by leveraging Resend's:

• Modern API
• Managed infrastructure
• Improved email authentication (SPF/DKIM)

---

⚙️ Changes Implemented

1️⃣ Replaced Email Service

• Deleted the old config/nodemailer.js file.
• Created a new config/resend.js service file that securely initializes the Resend client using an API key.

2️⃣ Updated Environment Configuration

• Removed legacy ADMIN_EMAIL and ADMIN_PASSWORD variables from config/env.js.
• Added new RESEND_API_KEY variable to handle authentication with Resend.
• Updated .env.example to reflect these new requirements.

3️⃣ Refactored Controller Logic

• Updated invitationToCollaborate controller to use the new Resend service.
• Switched to modern async/await syntax instead of callbacks, simplifying the code and improving error handling.

4️⃣ Added Dependencies

• Added resend to package.json.

---

1. Sign up for a free account at Resend.com.
2. Verify a sending domain as per Resend instructions.
3. Create a new API key.
4. Add the new key and your verified email to your local .env file:

# .env
RESEND_API_KEY="re_YourSecretKeyGoesHere"
ADMIN_EMAIL="you@your-verified-domain.com"

[vercel]

@100NikhilBro is attempting to deploy a commit to the avdheshvarshney's projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

Thank you for submitting your pull request! We'll review it as soon as possible. For further communication, join our discord server https://discord.gg/tSqtvHUJzE.

[100NikhilBro]

Hi @Avdhesh-Varshney, I’ve updated the setup from Nodemailer to Resend. Please review the changes and let me know if you have any suggestions or improvements. I’ll make the necessary updates before creating the PR.

[Avdhesh-Varshney]

Keep the indentation of your editor to be 2-space. This should not be repeated everytime.

[100NikhilBro]

Hi @Avdhesh-Varshney, sorry for missing the 2-space indentation this time — I’ll make sure to follow it properly next time. 🙏
I’ve also made the requested changes. Please review the PR, and if everything looks good, kindly merge it.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Comments	Updated (UTC)
code-a2z-server	Ready	Preview	Comment	Oct 11, 2025 0:31am

[Avdhesh-Varshney]

Approved and Working 🎉
Thanks for this amazing contribution 😄