diff --git a/smtp/smtp.py b/smtp/smtp.py
index de970b2..ea45cd6 100644
--- a/smtp/smtp.py
+++ b/smtp/smtp.py
@@ -22,7 +22,7 @@ captchas: dict[str, list[str, str]] = {}
 def send_email():
     def build_captcha() -> str:
         captcha: str = ""
-        for i in range(0,4):
+        for i in range(0,6):
             digit: int = random.randint(0,9)
             captcha += str(digit)
         return captcha