we’ve just published a very useful and FREE plugin for verifying emails
Mailboxlayer lets you to thoroughly check and verify email addresses right at the point of entry into your system.
In addition to checking the syntax, the actual existence of an email address using MX-Records and the Simple Mail Transfer Protocol (SMTP), and detecting whether or not the requested mailbox is configured to catch all incoming mail traffic, the mailboxlayer API is linked to a number of regularly updated databases containing all available email providers, which simplifies the separation of disposable (e.g. “mailinator”) and free email addresses (e.g. “gmail”, “yahoo”) from individual domains.
Combined with typo checks, did-you-mean suggestions and a numeric score reflecting the quality of each email address, these structures will make it simple to automatically filter “real” customers from abusers and increase response and success rates of your email campaigns.
this is the link to the plugin https://bubble.io/plugin/mailboxlayer---verify-emails-1516434275441x434831550545657860
And check this page for all our plugins for Bubble https://zeroqode.com/plugins
Founder @ Zeroqode & Bubblewits