diff --git a/smtp_connector.py b/smtp_connector.py
index 4bc3af5..e977d50 100644
--- a/smtp_connector.py
+++ b/smtp_connector.py
@@ -836,9 +836,15 @@ def _send_email(self, param, action_result):
 
         # username = self.get_config()[phantom.APP_JSON_USERNAME]
         config = self.get_config()
+        sender_address = config.get("sender_address")
+
+        if sender_address:
+            ret_val = self._validate_sender_email(action_result, sender_address)
+            if phantom.is_fail(ret_val):
+                return action_result.get_status()
+        else:
+            sender_address = config.get(phantom.APP_JSON_USERNAME)
 
-        # Derive 'from' email address
-        sender_address = config.get('sender_address', config.get(phantom.APP_JSON_USERNAME))
         email_from = param.get(SMTP_JSON_FROM, sender_address)
 
         # validate sender email if inputted as a parameter