public void setAttribute(String attribute) {
        this.attribute = attribute;
    }
<p>
The boolean type representing the allowed attribute types for an email.
</p>

@param attribute
       The boolean type representing the allowed attribute types for an email.
@see RuleBooleanEmailAttribute
aws-java-sdk-mailmanager/src/main/java/com/amazonaws/services/mailmanager/model/RuleBooleanToEvaluate.java