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REQUIREMENTS
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Extend-Associations: http://bakery.cakephp.org/articles/view/add-delete-habtm-behavior
JQuery for ajax calls in admin_send.ctp

You MUST have a sendEmail() function in your Appcontroller
a demo sendEmail() function that uses SwiftMailer (http://swiftmailer.org/) can be found here http://wiki.github.com/fabiokr/cakephp-newsletter-plugin


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INSTALLATION & CONFIGURATION
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drop the plugin files in the folder app/plugins/newsletter/

create the necessary DB tables using either:
the file in app/plugins/newsletter/config/sql/schema.sql

or via shell copy app/plugins/newsletter/config/sql/newsletter.php in app/config/sql/
and run:

cake schema run create -name Newsletter


Open app/plugins/newsletter/config/newsletter.php
Define the required configuration variables

Enjoy!

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TODO
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Explain Configuration Fields
$subject = Configure::read('Newsletter.unsubscribe_subject');
$subject = Configure::read('Newsletter.subscribe_subject');
$from = Configure::read('Newsletter.from'); #Required
$from_email = Configure::read('Newsletter.from_email'); #Required

$subject = Configure::read('Newsletter.sendX'); #Number of emails to sent at each admin_send call.
$subject = Configure::read('Newsletter.sendInterval'); #the interval time before send next batch
$subject = Configure::read('Newsletter.mail_opt_out_message');
$subject = Configure::read('Newsletter.emptyImagePath');