Kirby custom SMTP email driver using PHPMailer (assumes SMTP authentication is required)

readme.md

In the Kirby root

composer require phpmailer/phpmailer

Add autoload.php and smtp.php to /site/plugins, and add appropriate SMTP configuration options to the relevant config file (see included config.php as an example).

autoload.php

<?php

require kirby()->roots()->index() . DS . 'vendor' . DS . 'autoload.php';

config.php

<?php

c::set('email.service', 'smtp');
c::set('email.options', [
    'host'     => 'host',
    'port'     => 'port',
    'user'     => 'user',
    'password' => 'password',
]);

smtp.php

<?php

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

email::$services['smtp'] = function($email) {

    if(empty($email->options['host']))     throw new Error('Missing SMTP host');
    if(empty($email->options['port']))     throw new Error('Missing SMTP port');
    if(empty($email->options['user']))     throw new Error('Missing SMTP user');
    if(empty($email->options['password'])) throw new Error('Missing SMTP password');

    $mail = new PHPMailer(true);

    try {

        $mail->isSMTP();
        $mail->Host     = $email->options['host'];
        $mail->Port     = $email->options['port'];
        $mail->SMTPAuth = true;
        $mail->Username = $email->options['user'];
        $mail->Password = $email->options['password'];

        $mail->setFrom($email->from);
        $mail->addAddress($email->to);

        if (!empty($email->replyTo)) $mail->addReplyTo($email->replyTo);
        if (!empty($email->cc))      $mail->addCC($email->cc);
        if (!empty($email->bcc))     $mail->addBCC($email->bcc);

        $mail->Subject = $email->subject;
        $mail->Body = $email->body;

        $mail->send();

    } catch (Exception $e) {
        throw new Error($mail->ErrorInfo);
    }
};