diff --git a/app.py b/app.py
index 2c21c25..9445345 100644
--- a/app.py
+++ b/app.py
@@ -208,7 +208,8 @@ def send_email_batch(users, smtp_config, mails_per_pack=100, time_per_pack=60, d
 
             try:
                 msg = MIMEMultipart()
-                msg['From'] = smtp_config["user"]
+                from_email = smtp_config["user"] or "unitra@unitraklub.pl"
+                msg['From'] = f"Unitra-Klub <{from_email}>"
                 msg['To'] = user['mail']
                 msg['Subject'] = "Twoje konto w unitraklub.pl"