public String deleteSubscription() {
try {
INewsletterManager newsletterManager = this.getNewsletterManager();
Subscriber subscriber = newsletterManager.loadSubscriber(this.getMailAddress());
if (null != subscriber) {
newsletterManager.deleteSubscriber(this.getMailAddress());
} else {
String[] args = {this.getMailAddress()};
this.addActionError(this.getText("jpnewsletter.messsage.emailNotPresent", args));
return INPUT;
}