diff --git a/hedgedoc-expire.py b/hedgedoc-expire.py
index e4c1cba..30567a3 100644
--- a/hedgedoc-expire.py
+++ b/hedgedoc-expire.py
@@ -64,7 +64,8 @@ class EmailSender:
             smtp_server = smtplib.SMTP(self.hostname, port=self.port)
             context = ssl.create_default_context()
             smtp_server.starttls(context=context)
-            smtp_server.login(self.username, self.password)
+            if self.username != "" and self.password != "":
+                smtp_server.login(self.username, self.password)
             smtp_server.send_message(message)
         except Exception as e:
             print(f'Unable to send mail through {self}: {e}')