behaviorOnMxFailure property
The action that Amazon Pinpoint to takes if it can't read the required MX
record for a custom MAIL FROM domain. 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.
Implementation
final BehaviorOnMxFailure behaviorOnMxFailure;