diff --git a/Lib/smtplib.py b/Lib/smtplib.py
index 43a00d9a4e3..6513842eb6c 100755
--- a/Lib/smtplib.py
+++ b/Lib/smtplib.py
@@ -54,7 +54,7 @@ import datetime
 import sys
 from email.base64mime import body_encode as encode_base64
 
-__all__ = ["SMTPException", "SMTPServerDisconnected", "SMTPResponseException",
+__all__ = ["SMTPException", "SMTPNotSupportedError", "SMTPServerDisconnected", "SMTPResponseException",
            "SMTPSenderRefused", "SMTPRecipientsRefused", "SMTPDataError",
            "SMTPConnectError", "SMTPHeloError", "SMTPAuthenticationError",
            "quoteaddr", "quotedata", "SMTP"]
diff --git a/Misc/NEWS.d/next/Library/2019-10-01-21-06-18.bpo-38341.uqwgU_.rst b/Misc/NEWS.d/next/Library/2019-10-01-21-06-18.bpo-38341.uqwgU_.rst
new file mode 100644
index 00000000000..dd1a6b080b6
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-10-01-21-06-18.bpo-38341.uqwgU_.rst
@@ -0,0 +1 @@
+Add :exc:`smtplib.SMTPNotSupportedError` to the :mod:`smtplib` exported names.