From b96a009bb3f2c189af1a921a7f50f547b19620f9 Mon Sep 17 00:00:00 2001
From: Erik Cederstrand <erik@cederstrand.dk>
Date: Tue, 19 Jan 2021 21:01:41 +0100
Subject: [PATCH] Backport of upstream commit 3b773ec9

See https://github.com/ecederstrand/exchangelib/commit/3b773ec924a6bed70cc0a4c410efeb28d3ed4994
---
 exchangelib/transport.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/exchangelib/transport.py b/exchangelib/transport.py
index 53a133fb..4c3fd51a 100644
--- a/exchangelib/transport.py
+++ b/exchangelib/transport.py
@@ -36,11 +36,11 @@
 
 
 def extra_headers(account):
+    """Generate extra HTTP headers
     """
-    Generate extra headers for impersonation requests. See
-    https://blogs.msdn.microsoft.com/webdav_101/2015/05/11/best-practices-ews-authentication-and-access-issues/
-    """
-    if account and account.access_type == IMPERSONATION:
+    if account:
+        # See
+        # https://blogs.msdn.microsoft.com/webdav_101/2015/05/11/best-practices-ews-authentication-and-access-issues/
         return {'X-AnchorMailbox': account.primary_smtp_address}
     return None