behaviorOnMxFailure

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

The custom MAIL FROM setup states that result in this behavior are Pending, Failed, and TemporaryFailure.