diff --git a/resources/lib/UnityMailer.php b/resources/lib/UnityMailer.php
index 73f59e32e..106cb722b 100644
--- a/resources/lib/UnityMailer.php
+++ b/resources/lib/UnityMailer.php
@@ -6,12 +6,10 @@
 use Exception;
 use Twig\TwigFunction;
 
-class UnityMailerException extends Exception {}
-
 /**
  * This is a class that uses PHPmailer to send emails based on templates
  */
-class UnityMailer extends PHPMailer
+class UnityMailer
 {
     private string $MSG_SENDER_EMAIL;
     private string $MSG_SENDER_NAME;
@@ -22,14 +20,8 @@ class UnityMailer extends PHPMailer
     private string $MSG_PI_APPROVAL_EMAIL;
     private string $MSG_PI_APPROVAL_NAME;
 
-    private \Twig\Loader\FilesystemLoader $loader;
-    private \Twig\Environment $twig;
-
     public function __construct()
     {
-        parent::__construct();
-        $this->isSMTP();
-
         $this->MSG_SENDER_EMAIL = CONFIG["mail"]["sender"];
         $this->MSG_SENDER_NAME = CONFIG["mail"]["sender_name"];
         $this->MSG_SUPPORT_EMAIL = CONFIG["mail"]["support"];
@@ -38,15 +30,22 @@ public function __construct()
         $this->MSG_ADMIN_NAME = CONFIG["mail"]["admin_name"];
         $this->MSG_PI_APPROVAL_EMAIL = CONFIG["mail"]["pi_approve"];
         $this->MSG_PI_APPROVAL_NAME = CONFIG["mail"]["pi_approve_name"];
+    }
+
+    private function constructPHPMailer(): PHPMailer
+    {
+        $mailer = new PHPMailer(exceptions: true);
+        $mailer->isSMTP();
+
         if (empty(CONFIG["smtp"]["host"])) {
             throw new Exception("SMTP server hostname not set");
         }
-        $this->Host = CONFIG["smtp"]["host"];
+        $mailer->Host = CONFIG["smtp"]["host"];
 
         if (empty(CONFIG["smtp"]["port"])) {
             throw new Exception("SMTP server port not set");
         }
-        $this->Port = CONFIG["smtp"]["port"];
+        $mailer->Port = CONFIG["smtp"]["port"];
 
         $security = CONFIG["smtp"]["security"];
         $security_conf_valid = empty($security) || $security == "tls" || $security == "ssl";
@@ -55,21 +54,21 @@ public function __construct()
                 "SMTP security is not set correctly, leave empty, use 'tls', or 'ssl'",
             );
         }
-        $this->SMTPSecure = $security;
+        $mailer->SMTPSecure = $security;
 
         if (!empty(CONFIG["smtp"]["user"])) {
-            $this->SMTPAuth = true;
-            $this->Username = CONFIG["smtp"]["user"];
+            $mailer->SMTPAuth = true;
+            $mailer->Username = CONFIG["smtp"]["user"];
         } else {
-            $this->SMTPAuth = false;
+            $mailer->SMTPAuth = false;
         }
 
         if (!empty(CONFIG["smtp"]["pass"])) {
-            $this->Password = CONFIG["smtp"]["pass"];
+            $mailer->Password = CONFIG["smtp"]["pass"];
         }
 
         if (CONFIG["smtp"]["ssl_verify"] == "false") {
-            $this->SMTPOptions = [
+            $mailer->SMTPOptions = [
                 "ssl" => [
                     "verify_peer" => false,
                     "verify_peer_name" => false,
@@ -77,22 +76,26 @@ public function __construct()
                 ],
             ];
         }
+        return $mailer;
+    }
 
-        $this->loader = new \Twig\Loader\FilesystemLoader([
+    private function constructTwigEnvironment(): \Twig\Environment
+    {
+        $loader = new \Twig\Loader\FilesystemLoader([
             __DIR__ . "/../../deployment/mail_overrides",
             __DIR__ . "/../mail",
         ]);
-        $this->twig = new \Twig\Environment($this->loader, ["strict_variables" => true]);
+        $twig = new \Twig\Environment($loader, ["strict_variables" => true]);
         $functions = [
-            new TwigFunction("setSubject", fn($x) => ($this->Subject = $x)),
             new TwigFunction("getRelativeHyperlink", getRelativeHyperlink(...)),
             new TwigFunction("formatHyperlink", formatHyperlink(...)),
             new TwigFunction("throw", fn($x) => throw new Exception($x)),
         ];
         foreach ($functions as $function) {
-            $this->twig->addFunction($function);
+            $twig->addFunction($function);
         }
-        $this->twig->addGlobal("CONFIG", CONFIG);
+        $twig->addGlobal("CONFIG", CONFIG);
+        return $twig;
     }
 
     /**
@@ -101,31 +104,31 @@ public function __construct()
      */
     public function sendMail(string|array $recipients, string $template, ?array $data = null): void
     {
+        $mailer = $this->constructPHPMailer();
+
+        $twig = $this->constructTwigEnvironment();
+        $twig->addFunction(new TwigFunction("setSubject", fn($x) => ($mailer->Subject = $x)));
+
         $data ??= [];
-        $this->setFrom($this->MSG_SENDER_EMAIL, $this->MSG_SENDER_NAME);
-        $this->addReplyTo($this->MSG_SUPPORT_EMAIL, $this->MSG_SUPPORT_NAME);
+        $mailer->setFrom($this->MSG_SENDER_EMAIL, $this->MSG_SENDER_NAME);
+        $mailer->addReplyTo($this->MSG_SUPPORT_EMAIL, $this->MSG_SUPPORT_NAME);
 
-        $mes_html = $this->twig->render("$template.html.twig", $data);
-        $this->msgHTML($mes_html);
+        $mes_html = $twig->render("$template.html.twig", $data);
+        $mailer->msgHTML($mes_html);
 
         if ($recipients == "admin") {
-            $this->addBCC($this->MSG_ADMIN_EMAIL, $this->MSG_ADMIN_NAME);
+            $mailer->addBCC($this->MSG_ADMIN_EMAIL, $this->MSG_ADMIN_NAME);
         } elseif ($recipients == "pi_approve") {
-            $this->addBCC($this->MSG_PI_APPROVAL_EMAIL, $this->MSG_PI_APPROVAL_NAME);
+            $mailer->addBCC($this->MSG_PI_APPROVAL_EMAIL, $this->MSG_PI_APPROVAL_NAME);
         } else {
             if (is_array($recipients)) {
                 foreach ($recipients as $addr) {
-                    $this->addBCC($addr);
+                    $mailer->addBCC($addr);
                 }
             } else {
-                $this->addAddress($recipients);
+                $mailer->addAddress($recipients);
             }
         }
-
-        $output = parent::send();
-        if ($output === false) {
-            throw new UnityMailerException($this->ErrorInfo);
-        }
-        $this->clearAllRecipients();
+        $mailer->send();
     }
 }