diff -r 3e897eef0fac Lib/smtplib.py
--- a/Lib/smtplib.py	Wed Mar 02 19:40:50 2016 +0200
+++ b/Lib/smtplib.py	Thu Mar 03 14:00:24 2016 +0700
@@ -241,7 +241,6 @@
         will be used.
 
         """
-        self._host = host
         self.timeout = timeout
         self.esmtp_features = {}
         self.command_encoding = 'ascii'
@@ -328,6 +327,7 @@
                     port = int(port)
                 except ValueError:
                     raise OSError("nonnumeric port")
+        self._host = host
         if not port:
             port = self.default_port
         if self.debuglevel > 0: