FOIA-552: Custom mailer for FOIA emails.

docroot/modules/custom/foia_webform/src/Plugin/Mail/CustomHtmlSymfonyMailer.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace Drupal\foia_webform\Plugin\Mail;
+
+use Drupal\Core\Mail\Attribute\Mail;
+use Drupal\Core\Mail\Plugin\Mail\SymfonyMailer;
+use Drupal\Core\StringTranslation\TranslatableMarkup;
+use Drupal\Core\Utility\Error;
+use Symfony\Component\Mime\Email;
+
+/**
+ * Sends HTML emails using Symfony Mailer.
+ */
+#[Mail(
+  id: 'custom_html_symfony_mailer',
+  label: new TranslatableMarkup('Custom HTML Symfony Mailer'),
+)]
+class CustomHtmlSymfonyMailer extends SymfonyMailer {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function format(array $message) {
+    $message['body'] = implode("\n\n", $message['body']);
+    return $message;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function mail(array $message) {
+    try {
+      $email = new Email();
+
+      $headers = $email->getHeaders();
+      foreach ($message['headers'] as $name => $value) {
+        if (!in_array(strtolower($name), ['content-type', 'content-transfer-encoding'], TRUE)) {
+          $headers->addHeader($name, $value);
+        }
+      }
+
+      $recipients = array_map(trim(...), str_getcsv($message['to'], escape: "\\"));
+
+      $email
+        ->to(...$recipients)
+        ->subject($message['subject'])
+        ->html($message['body']);
+
+      $mailer = $this->getMailer();
+      $mailer->send($email);
+
+      return TRUE;
+    }
+    catch (\Exception $e) {
+      Error::logException($this->logger, $e);
+      return FALSE;
+    }
+  }
+
+}