I've been using Mailguns validator [0] for a while now and have been quite pleased. It catches common typos and validates DNS on the host name. [0] https://doc

I've been using Mailguns validator [0] for a while now and have been quite pleased. It catches common typos and validates DNS on the host name. [0] https://documentation.mailgun.com/api-email-validation.html https://documentation.mailgun.com/api-email-validation.html