behaviorOnMxFailure

The action for Amazon SES to take if it cannot successfully read the required MX record when you send an email. If you choose UseDefaultValue, Amazon SES uses amazonses.com (or a subdomain of that) as the MAIL FROM domain. If you choose RejectMessage, Amazon SES returns a MailFromDomainNotVerified error and not send the email.

The action specified in BehaviorOnMXFailure is taken when the custom MAIL FROM domain setup is in the Pending, Failed, and TemporaryFailure states.