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 2229d80c0..ff2723b11 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
@@ -43,7 +43,7 @@ public MailService(final @Value("${mailSMTPServer}") String smtpServer
 		String smtpUserPassword = System.getenv("SMTP_USER_PASSWORD");
 
   		Properties props = new Properties();
-		props.put("mail.smtp.auth", true);
+		props.put("mail.smtps.auth", true);
 
 		mailSender.setJavaMailProperties(props);
 		mailSender.setHost(smtpServer);