behaviorOnMxFailure

The action that you want Amazon Pinpoint to take if it can't read the required MX record when you send an email. When you set this value to UseDefaultValue, Amazon Pinpoint uses amazonses.com as the MAIL FROM domain. When you set this value to RejectMessage, Amazon Pinpoint returns a MailFromDomainNotVerified error, and doesn't attempt to deliver the email.

These behaviors are taken when the custom MAIL FROM domain configuration is in the Pending, Failed, and TemporaryFailure states.