diff --git a/backend/src/main/java/de/uni_koeln/arachne/service/MailService.java b/backend/src/main/java/de/uni_koeln/arachne/service/MailService.java
index 126a6e4d7..2f7664836 100644
--- a/backend/src/main/java/de/uni_koeln/arachne/service/MailService.java
+++ b/backend/src/main/java/de/uni_koeln/arachne/service/MailService.java
@@ -44,7 +44,7 @@ public MailService(final @Value("${mailSMTPServer}") String smtpServer
 
   		Properties props = new Properties();
 		props.put("mail.smtp.auth", true);
-		props.put("mail.transport.protocol","smtp");
+		props.put("mail.smtp.ssl.enable", true);
         props.put("mail.debug", "true");
 
 		mailSender.setJavaMailProperties(props);