1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/smtpd.py b/Lib/smtpd.py
index 599e79b7ed..32f45ae768 100755
--- a/Lib/smtpd.py
+++ b/Lib/smtpd.py
@@ -275,7 +275,7 @@ class SMTPChannel(asynchat.async_chat):
             return
         elif limit:
             self.num_bytes += len(data)
-        self.received_lines.append(str(data, "utf8"))
+        self.received_lines.append(str(data, "utf-8"))
 
     # Implementation of base class abstract method
     def found_terminator(self):