diff --git a/Lib/smtplib.py b/Lib/smtplib.py
index 18c91746fd7bf2..020ab3e3ee3e7f 100755
--- a/Lib/smtplib.py
+++ b/Lib/smtplib.py
@@ -51,6 +51,7 @@
import hmac
import copy
import datetime
+import platform
import sys
from email.base64mime import body_encode as encode_base64
@@ -263,7 +264,17 @@ def __init__(self, host='', port=0, local_hostname=None,
# if that can't be calculated, that we should use a domain literal
# instead (essentially an encoded IP address like [A.B.C.D]).
fqdn = socket.getfqdn()
- if '.' in fqdn:
+
+ # Get information about the platform the program is running on
+ platform_string = platform.platform().lower()
+
+ # Check if the environment is Windows Subsystem for Linux (WSL)
+ is_wsl = "microsoft" in platform_string and "linux" in platform_string
+
+ # If it's WSL, adjust the hostname by removing the last character (the dot)
+ if is_wsl:
+ self.local_hostname = fqdn[:-1]
+ elif '.' in fqdn:
self.local_hostname = fqdn
else:
# We can't find an fqdn hostname, so use a domain literal
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