How to validate your recipient email address 

Email Validation – Why It Matters

Email Validation helps you verify recipient addresses before sending emails — filtering out invalid, risky, or undeliverable contacts. This improves inbox delivery and protects your domain from being blocked due to high bounce rates.

Why You Should Validate Your Emails

Email validation is not just a cleanup tool — it’s a deliverability booster and reputation shield.

Key Benefits:

• Improve Inbox Delivery: Reach real people, not invalid or fake addresses.

• Reduce Bounce Rates: Minimize email failures and rejections.

• Avoid Domain Blacklisting: High bounce rates can damage your domain reputation and trigger blocking by major email services.

• Protect Your Sender Score: ISPs (like Gmail, Outlook, etc.) monitor sender performance. Validating your list helps keep your score high.

• Increase ROI on Campaigns: Better list quality = better engagement, open rates, and conversions.

How to Use Email Validation in MSG91

You can validate emails using either the API or MSG91 panel:

For real-time or bulk validation from your system.
👉 Validate Emails via APi

1. Bulk Email Validation

• Go to Email > Email Validation > Bulk Validation

• Upload your contact list (.CSV)

• Optionally name the file and click Upload

• View status: Processing → Completed

• Get complete validation results with download option
  

2. Single Email Validation

• Go to Email > Email Validation > Validate Email

• Enter email addresses

• Click Validate

• View instant results in categorized format
  
  

3) Send Email via MSG91 Dashboard

You can also validate email addresses directly while sending emails from the MSG91 dashboard using the Send Email option.

• Simply click on Send Email

• Upload your data, Select Segmento or CSV file

• Enable the "Validate Email Before Sending" option to ensure all email addresses are verified before sending

This helps improve email deliverability and enhances your domain reputation by avoiding invalid or inactive email addresses.

Email Validation Settings

MSG91 provides Email Validation Settings on the dashboard, allowing you to control how email validation results are used while sending emails.

• You can define how long a previous validation result should be reused by setting a time value in seconds. Once this duration expires, the email address will be revalidated.

• You can also choose which validation result types are allowed for sending emails. The available options are:

  • All

  • Deliverable

  • Risky

  • Unknown

For best performance and to minimize email failures, we strongly recommend allowing Deliverable emails only.

This configuration helps improve delivery rates and reduces the chances of domain suspension due to high failure rates.

4) Send Email via API

You can also validate emails while sending via API.
Simply use the Send Email API and pass the following parameter:

"validate_before_send": true

This ensures that all recipient email addresses are validated before sending, helping you improve deliverability, protect your domain reputation, and target only active email IDs.

Important: To avoid domain blocking, always keep your email failure rate below 3% and ensure the complaint rate does not exceed 0.3%..
We strongly recommend validating your email list before each campaign to ensure safe and successful delivery.

Need help? Our team is here to guide you through email validation and ensure your campaigns perform at their best.