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 ff2723b11..b7546f5bd 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 +44,8 @@ public MailService(final @Value("${mailSMTPServer}") String smtpServer
 
   		Properties props = new Properties();
 		props.put("mail.smtps.auth", true);
-
+		props.put("mail.transport.protocol","smtp");
+		props.put("mail.smtp.tls", "true");
 		mailSender.setJavaMailProperties(props);
 		mailSender.setHost(smtpServer);
 		mailSender.setUsername(smtpUserName);