Please note that this documentation is for the most recent version of this extension. It may not be relevant for older versions. Related documentation can be found in the documentation directory of the extension.
The AMP-Form doesn't send a mail - what to do?
The AMP Form-Library appends a parameter '__amp_source_origin' automatically to the AJAX query string. This results in a 404 error because of an TYPO3 c-hash issue.
The only way to solve that problem, is to set Install-Tool setting '[FE][pageNotFoundOnCHashError]' to false.