From 5eb99a6f5aa5afe136b9d81621e2a78058dfcfcb Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 6 Nov 2017 09:47:46 +0530
Subject: [PATCH] ...

---
 src/calibre/utils/smtplib.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/utils/smtplib.py b/src/calibre/utils/smtplib.py
index 820af3babf..79474f0558 100755
--- a/src/calibre/utils/smtplib.py
+++ b/src/calibre/utils/smtplib.py
@@ -279,7 +279,7 @@ class SMTP:
             # 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 and fqdn != '.':
+            if '.' in fqdn and fqdn != '.':  # Changed by Kovid
                 self.local_hostname = fqdn
             else:
                 # We can't find an fqdn hostname, so use a domain literal