Robuta

https://www.zerobounce.net/apis/email-validation-api
ZeroBounce offers a real-time email validation API for seamless integration to ensure email list cleanliness and improve deliverability.
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https://check-mail.org/
Check-Mail is a free API service to validate email addresses, to check if an email is valid or disposable. The API combines blacklists with advanced heuristics...
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https://www.mailgun.com/features/email-list-validation/
Optimize your email marketing with Mailgun's powerful email list validation tool. Remove invalid addresses and boost your sender reputation. Try it free now.
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https://www.zerobounce.net/solutions/developers
Discover ZeroBounce's email validation API for developers. 99.6% accurate API for automating email verification in applications. Available in 13+...
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https://www.techtimes.com/articles/296025/20230906/gamalogic-email-validation-api-catch-verification-tool-boost-marketing-campaign.htm
Legitimate marketing emails end up in Spam folders when unverified. Learn how Gamalogic Catch-all Email Validation API prevents this from happening.
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https://disify.com/
Validate and Verify Email Address. Check if email address is disposable, temporary, has invalid MX records, detect if its mistyped, inactive or non-existent.
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