public String getBehaviorOnMxFailure() {
        return this.behaviorOnMxFailure;
    }
<p>
The action to take if the required MX record isn't found when you send an email. When you set this value to
<code>UseDefaultValue</code>, the mail is sent using <i>amazonses.com</i> as the MAIL FROM domain. When you set
this value to <code>RejectMessage</code>, the Amazon SES API v2 returns a <code>MailFromDomainNotVerified</code>
error, and doesn't attempt to deliver the email.
</p>
<p>
These behaviors are taken when the custom MAIL FROM domain configuration is in the <code>Pending</code>,
<code>Failed</code>, and <code>TemporaryFailure</code> states.
</p>

@return The action to take if the required MX record isn't found when you send an email. When you set this value
        to <code>UseDefaultValue</code>, the mail is sent using <i>amazonses.com</i> as the MAIL FROM domain.
        When you set this value to <code>RejectMessage</code>, the Amazon SES API v2 returns a
        <code>MailFromDomainNotVerified</code> error, and doesn't attempt to deliver the email.</p>
        <p>
        These behaviors are taken when the custom MAIL FROM domain configuration is in the <code>Pending</code>,
        <code>Failed</code>, and <code>TemporaryFailure</code> states.
@see BehaviorOnMxFailure
aws-java-sdk-sesv2/src/main/java/com/amazonaws/services/simpleemailv2/model/PutEmailIdentityMailFromAttributesRequest.java