Email validation is a hard problem that every single developer, building anything on the web, has to deal with.We actually have been working on email validation ourselves for years (more on that below).This is not intended to be a bulk mailing list cleaning service and we reserve the right to disable your account if we see it being used as such.To call the Guardpost API, just use the publishable API Key in the My Account tab of your Mailgun account (the one with the "pub-key" prefix).The third parameter is a Match Evaluator delegate that represents the method that processes and replaces the matched text.
This article uses the term email address to refer to the addr-spec defined in RFC 5322, not to the address that is commonly used; the difference is that an address may contain a display name, a comment, or both. [email protected] made up of a local-part, an @ symbol, then a case-insensitive domain. The ending quotation mark must not be preceded by a backslash character (\). An email address identifies an email box to which email messages are delivered.We're launching this as a free service that anyone collecting email through web forms can (and should! You'll need a Mailgun account to use the service, but you don't have to send your emails through Mailgun.If you want to get started right away, check out the API documentation, or a little sample jquery app, as an example of how to use Guardpost in a signup form.There's only one real answer to this: a valid email address is one that you can send emails to.