diff --git a/tools/patman/gitutil.py b/tools/patman/gitutil.py
index cc5a55a..c593070 100644
--- a/tools/patman/gitutil.py
+++ b/tools/patman/gitutil.py
@@ -392,7 +392,8 @@
                    "Or do something like this\n"
                    "git config sendemail.to u-boot@lists.denx.de")
             return
-    cc = BuildEmailList(series.get('cc'), '--cc', alias, raise_on_error)
+    cc = BuildEmailList(list(set(series.get('cc')) - set(series.get('to'))),
+                        '--cc', alias, raise_on_error)
     if self_only:
         to = BuildEmailList([os.getenv('USER')], '--to', alias, raise_on_error)
         cc = []