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.check_headers_valid

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Checks that headers is a valid dictionary for a header.

headers The value to check for the headers.

InvalidEmailError If headers is invalid.