Programming

Replacing EmailJS with Mailchimp for Newsletter Subscription

Selma Baldeh

Selma Baldeh

— 2 min read
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Replacing EmailJS with Mailchimp for Newsletter Subscription

Initially, I implemented a newsletter subscription feature in my React application using EmailJS. The goal was to send emails directly upon user subscription. However, this approach presented several challenges, particularly related to CORS restrictions and the limitations of handling API-based email services in a frontend-only environment.

Step 1: Identifying the Limitations

While EmailJS allowed basic email functionality, it was not optimized for managing subscriber lists. Additionally, I encountered inconsistent behavior and debugging difficulties, which highlighted the limitations of relying on client-side API calls for this use case.

Step 2: Transitioning to Mailchimp

To address these issues, I transitioned to Mailchimp, a platform specifically designed for email marketing, audience management, and automated communication. This provided a more robust and scalable solution.

Step 3: Configuring the Signup Form

Within Mailchimp, I navigated to:

  • Contacts → Audience → Signup forms → Embedded form

From there, I obtained the form’s action URL, which enables direct submission of user data to Mailchimp without requiring custom API integration.

Step 4: Integrating with the React Application

I replaced the EmailJS implementation with a standard HTML form embedded within my React component:

<form
  action="MAILCHIMP_FORM_URL"
  method="POST"
  target="_blank"
>
  <input type="email" name="EMAIL" required />
  <button type="submit">Subscribe</button>
</form>

This approach leverages native form submission, ensuring compatibility and eliminating the need for additional client-side logic.

Step 5: Resolving Integration Issues

During implementation, I encountered a “Blank email address” error. This was resolved by:

  • Ensuring the input field included name="EMAIL"
  • Using the correct Mailchimp endpoint (list-manage.com)
  • Removing incorrect domains (e.g., gmail.us4)
  • Replacing encoded characters (&amp;) with & in the form URL

Step 6: Implementing Automation

To enhance user experience, I configured an automated welcome email using Mailchimp’s Customer Journeys:

  • Trigger: “Contact signs up”
  • Action: Send welcome email

Step 7: Testing the Workflow

The final workflow operates as follows:

  1. The user submits their email via the form
  2. Mailchimp processes the subscription (with optional double opt-in)
  3. The contact is added to the audience
  4. A welcome email is automatically sent

Conclusion

Replacing EmailJS with Mailchimp significantly improved the reliability and scalability of the subscription system. This solution eliminates frontend API limitations, simplifies implementation, and provides built-in tools for audience management and automated communication, making it well-suited for modern web applications.

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