Add-on for validation before sending any mail?

[unproperlypropagated]

Hello! I wonder if there's any add-on for validation before sending the first mail, that uses services like:

mails.so — Unbeatably simple email validation ​

Check if an email address is valid for free. Prevent fraud, dodge fake users, and preserve your sender reputation.

mails.so

Email Address Verification Service ​

Verify your email list in minutes, or integrate real-time email verification into your app with our API. Over 26 billion emails verified. Get started for free.

kickbox.com

Email Validation API | Email Verification Experts | Email Hygiene ​

Verify email addresses with precision accuracy, perform expert email validation with the most trusted service for email deliverability sender reputation and email verification. Validate email addresses by API with bulk email list hygiene made easy.

www.ipqualityscore.com
Add-on for validation before sending any mail?

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