diff --git a/mail/signup.tpl b/mail/signup.html
similarity index 85%
rename from mail/signup.tpl
rename to mail/signup.html
index c93b404..480e0c1 100644
--- a/mail/signup.tpl
+++ b/mail/signup.html
@@ -1,13 +1,13 @@
 Hi,
-
-You recently signed up on MapGuesser with this email address ({{EMAIL}}). To activate your account, please click on the following link:
+<br><br>
+You recently signed up on MapGuesser with this email address ({{EMAIL}}). To activate your account, please click on the following link:<br>
 <a href="{{ACTIVATE_LINK}}" title="Account activation">{{ACTIVATE_LINK}}</a>
-
-If you did not sign up on MapGuesser or changed your mind, no further action is required, your email address will be deleted soon.
-However if you want to immediately delete it, please click on the following link:
+<br><br>
+If you did not sign up on MapGuesser or changed your mind, no further action is required, your email address will be deleted soon.<br>
+However if you want to immediately delete it, please click on the following link:<br>
 <a href="{{CANCEL_LINK}}" title="Sign up cancellation">{{CANCEL_LINK}}</a>
-
+<br><br>
 Have fun on MapGuesser!
-
-Regards,
+<br><br>
+Regards,<br>
 MapGuesser
diff --git a/src/Mailing/Mail.php b/src/Mailing/Mail.php
index 4c75dcb..0f14b68 100644
--- a/src/Mailing/Mail.php
+++ b/src/Mailing/Mail.php
@@ -27,7 +27,7 @@ class Mail
 
     public function setBodyFromTemplate(string $template, array $params = []): void
     {
-        $this->body = file_get_contents(ROOT . '/mail/' . $template . '.tpl');
+        $this->body = file_get_contents(ROOT . '/mail/' . $template . '.html');
 
         foreach ($params as $key => $param) {
             $this->body = str_replace('{{' . $key . '}}', $param, $this->body);
@@ -62,9 +62,8 @@ class Mail
         $mailer->addReplyTo($_ENV['MAIL_FROM'], 'MapGuesser');
 
         $mailer->Sender = !empty($_ENV['MAIL_BOUNCE']) ? $_ENV['MAIL_BOUNCE'] : $_ENV['MAIL_FROM'];
-
         $mailer->Subject = $this->subject;
-        $mailer->Body = $this->body;
+        $mailer->msgHTML($this->body);
 
         foreach ($this->recipients as $recipient) {
             $this->sendMail($mailer, $recipient);