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 b7546f5bd..8fb4264ef 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
@@ -46,6 +46,9 @@ public MailService(final @Value("${mailSMTPServer}") String smtpServer
 		props.put("mail.smtps.auth", true);
 		props.put("mail.transport.protocol","smtp");
 		props.put("mail.smtp.tls", "true");
+
+        props.put("mail.debug", "true");
+
 		mailSender.setJavaMailProperties(props);
 		mailSender.setHost(smtpServer);
 		mailSender.setUsername(smtpUserName);