Notice: Over the next few months, we're reorganizing the App Engine documentation site to make it easier to find content and better align with the rest of Google Cloud products. The same content will be available, but the navigation will now match the rest of the Cloud products.

Python 3.10 is now generally available.

google.appengine.api.mail.InvalidEmailReason

Determines the reason why an email is invalid.

email_address Email address to check.
field Field that is invalid.

A string that indicates the reason why an email is invalid; otherwise returns None.