diff --git a/matemat/webserver/pagelets/receipt_smtp_cron.py b/matemat/webserver/pagelets/receipt_smtp_cron.py
index 6095d7b..b9ceafe 100644
--- a/matemat/webserver/pagelets/receipt_smtp_cron.py
+++ b/matemat/webserver/pagelets/receipt_smtp_cron.py
@@ -72,7 +72,7 @@ def _send_receipt_mails(receipts: List[Receipt],
         # Attempt to upgrade to a TLS connection
         try:
             con.starttls()
-        except:
+        except BaseException:
             # If STARTTLS failed, only continue if explicitly requested by configuration
             if config['SmtpEnforceTLS'] != '0':
                 logger.error('STARTTLS not supported by SMTP server, aborting!')