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: over 1 year ago
What I mean by valid is whether it is deliverable or not. Like this https://mailboxlayer.com/. Source: over 1 year 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 / about 2 years ago
You can look into APIs ( example https://mailboxlayer.com/ ) they provide info whether email is from a disposable domain. Source: over 2 years ago
Mailboxlayer.com — Email validation and verification JSON API for developers. 1,000 free API requests/month. - Source: dev.to / almost 3 years ago
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