Magento display message on page - validation

Question

I start to give my luck on magento for weeks now. Challenges since then. I am trying to display message above my input box but to no avail. Below are my phtml and controller.
password.phtml
<div id="account-profile">
<?php echo $this->getMessagesBlock()->getGroupedHtml() ?>
<form action="<?php echo Mage::getUrl('customer/account/emailopt'); ?>" method="post">
<input name="form_key" type="hidden" value="<?php echo Mage::getSingleton('core/session')->getFormKey() ?>" />
<div class="fieldset">
<ul class="form-list">
<li class="fields">
<div class="field">
<div class="input-box">
<label for="email"><?php echo $this->__('Email') ?><span class="required">*</span></label>
<input name="email" id="email" title="Email" value="" class="required-entry input-text validate-email" type="text" />
</div>
</div>
</li>
</ul>
</div>
<button type="submit" class="btn-dbbdr" title="<?php echo $this->__('Edit Options') ?>"><span><span><?php echo $this->__('Edit Options') ?></span></span></button>
</form>
accountController.php
public function emailoptAction()
{
if (!$this->_validateFormKey()) {
return $this->_redirect('*/emailoptions');
}
$customer = Mage::getSingleton('customer/session')->getCustomer();
$email = $customer->getEmail();
$_email =$this->getRequest()->getParam('email');
if ($email != $_email) {
echo 'This is not your valid email';
} else {
echo 'proceed here';
}
$this->_redirect('*/emailoptions');
}
what happens here is everytime i click on submit, it just echo the message and then redirect to that page again.

Answer 1

You are redirecting after echoing that might not work.
Use bellow code for message display.
$message = $this->__('Error: This is not your valid email');
Mage::getSingleton('core/session')->addError($message);
More Information here
UPDATE
public function emailoptAction()
{
if (!$this->_validateFormKey()) {
return $this->_redirect('*/emailoptions');
}
$customer = Mage::getSingleton('customer/session')->getCustomer();
$email = $customer->getEmail();
$_email =$this->getRequest()->getParam('email');
if ($email != $_email) {
//echo 'This is not your valid email';
$message = $this->__('This is not your valid email');
Mage::getSingleton('core/session')->addError($message);
} else {
//echo 'proceed here';
$message = $this->__('proceed here');
Mage::getSingleton('core/session')->addSuccess($message);
}
$this->_redirect('*/emailoptions');
}

Answer 2

If you are working in admin panel then use this
Mage::getSingleton('adminhtml/session')->addError("Error here");
otherwise use this for frontend
Mage::getSingleton('core/session')->addError("Error here");
For checkout
Mage::getSingleton('checkout/session')->addError("Error here");
Use these codes in your controller.
Easy i think
if ($email != $_email) {
Mage::getSingleton('adminhtml/session')->addError("Not valid"); //change adminhtml as per need
$this->_redirect('your page');
} else {
Mage::getSingleton('adminhtml/session')->addSuccess("Valid");
$this->_redirect('your page');
}