public MessageInsightsFilters withSubject(java.util.Collection<String> subject) {
        setSubject(subject);
        return this;
    }
<p>
The subject line of the message.
</p>

@param subject
       The subject line of the message.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-sesv2/src/main/java/com/amazonaws/services/simpleemailv2/model/MessageInsightsFilters.java