diff --git a/application/libraries/Email_messages.php b/application/libraries/Email_messages.php
index e5f55a0420..b654b6bf28 100644
--- a/application/libraries/Email_messages.php
+++ b/application/libraries/Email_messages.php
@@ -116,7 +116,6 @@ public function send_appointment_saved(
 
         $php_mailer->addAddress($recipient_email);
 
-        $php_mailer->isHTML();
         $php_mailer->Subject = $subject;
         $php_mailer->Body = $html;
         $php_mailer->AltBody = $html;
@@ -188,7 +187,6 @@ public function send_appointment_deleted(
 
         $php_mailer->addAddress($recipient_email);
 
-        $php_mailer->isHTML();
         $php_mailer->Subject = $subject;
         $php_mailer->Body = $html;
         $php_mailer->AltBody = $html;
@@ -223,7 +221,6 @@ public function send_password(string $password, string $recipient_email, array $
 
         $php_mailer->addAddress($recipient_email);
 
-        $php_mailer->isHTML();
         $php_mailer->Subject = $subject;
         $php_mailer->Body = $html;
         $php_mailer->AltBody = $html;
@@ -242,6 +239,7 @@ private function get_php_mailer(): PHPMailer
     {
         $php_mailer = new PHPMailer(true);
 
+        $php_mailer->isHTML();
         $php_mailer->CharSet = 'UTF-8';
         $php_mailer->SMTPDebug = config('smtp_debug') ? SMTP::DEBUG_SERVER : null;