diff --git a/server/smsgate.py b/server/smsgate.py
index 56ed603..9becc9b 100755
--- a/server/smsgate.py
+++ b/server/smsgate.py
@@ -137,7 +137,7 @@ def _do_smtp_delivery(self):
 
         while True:
             try:
-                self.l.debug("Check delivery queue if E-mail should be sent.")
+                self.l.debug("Check delivery queue if E-mail should be sent. There are about %d SMS in the SMTP delivery queue." % self.smtp_delivery_queue.qsize())
                 _sms = self.smtp_delivery_queue.get(timeout=10)
                 self.l.info(f"[{_sms.get_id()}] Event in SMS-to-Mail delivery queue.")
                 if _sms: