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I am trying to intercept outgoing emails from joomla and reroute them to my email address for development and testing. Ideally I could set up a toggle under Global Configuration > Server > Email settings so that other non-developer teammates can control it easily as well, but the back end needs to be in place first.

If there is a plugin or built in that handles this kind of thing, that would be great but I can't find it.

I have read through and attempted the following (very old) solutions but I don't think it is going to work with 3.9. At least not without some tweaking:

I found a newer override solution, but I'm not sure it will work with core joomla email functions:

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  • Welcome to JSE, Joseph. This is a well-crafted question with proof of research -- good job. Please take our tour and consider telling us a bit about your Joomla journey by editing your profile. Please continue to work on this challenge while you wait for assistance. If you manage to self-solve, you are encouraged to post an educational answer to your own question. Hopefully our membership will be able to offer some guidance in the very near future. – mickmackusa Jan 30 at 3:54
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You could use this extension: https://extensions.joomla.org/extension/jmail-queue/

And then simply view the emails in the queue. Or add the onInjection plugin to remove all the recipients and substitute the one you want.

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  • Congratulations on making your first post and thank you for contributing to the knowledge pool. Please take our tour. – mickmackusa Feb 5 at 20:34
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I'm not sure how reliable this is but it can be done by setting Joomla\CMS\Factory::$mailer to an instance of your custom mailer. This should be done by a system plugin early in the request. The class should extend Joomla\CMS\Mail\Mail and the instance should already be configured to use settings from global configuration.

defined('_JEXEC') or exit;

use Joomla\CMS\Factory;
use Joomla\CMS\Plugin\CMSPlugin;

class PlgSystemCustommail extends CMSPlugin
{
    public function onAfterInitialise()
    {
        // This check isn't necessary but it ensures mail is sent using only one mailer, whichever it may be. Add custom logic as needed.
        if (Factory::$mailer === null)
        {
            // Set the mailer.
            Factory::$mailer = $this->createMailer();
        }
    }
    
    private function createMailer(): MyMail
    {
        // Load the custom class.
        JLoader::register('MyMail', __DIR__ . '/mymail.php');

        // Instantiate the custom mailer.
        $mailer = new MyMail;
        
        // Configure the mailer here. See `Joomla\CMS\Factory::createMailer()` for an example.
        
        // Return the mailer instance.
        return $mailer;
    }
}

Custom mailer class modified to send mail to specific address:

defined('_JEXEC') or exit;

use Joomla\CMS\Mail\Mail;

class MyMail extends Mail
{
    public function send()
    {
        // Clear recipient list.
        $this->clearAddresses();
        
        // Add custom recipient.
        $this->addRecipient($address, $name);
        
        return parent::send();
    }
}

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