
NeverBounce
Kickbox
ZeroBounce
Email Checker
Email List Verify
Email Verifier
emailvalidation.io
Mailboxlayer is a free, simple and powerful JSON API offering instant email address validation & verification via syntax checks, typo and spelling checks, SMTP checks, free and disposable provider filtering, and much more.

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Which is more popular?
Based on our record, mailboxlayer API seems to be more popular. It has been mentioned 5 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | mailboxlayer.com | opendevdocs.com |
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Recommendations tracked on public social media and blogs since March 2021.


I've found a few "free" APIs which tell you if the email address exists or not, they have a free tier for certain amount of queries. Try https://mailboxlayer.com and https://www.zerobounce.net. Source: about 4 years ago
What I mean by valid is whether it is deliverable or not. Like this https://mailboxlayer.com/. Source: about 4 years ago
In Inspector we use the mailboxlayer.com API to validate emails. The service is also able to detect fake email addresses, temporary addresses, and the actual existence of an email address using MX-Records and SMTP. - Source: dev.to / over 4 years ago
Tracking Open Devdocs since Jan 2023.
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