diff --git a/surveillance/arpwatch_sendmail.py b/surveillance/arpwatch_sendmail.py
index 634b88d6..058e9714 100644
--- a/surveillance/arpwatch_sendmail.py
+++ b/surveillance/arpwatch_sendmail.py
@@ -25,7 +25,7 @@ if __name__ == "__main__":
     i = textes.index(u'\n')
     textes[i-1:i-1] = [
             u'MIME-Version: 1.0\n', 
-            u'Content-Type: text/plain; charset=UTF-8; format=flowed\n', 
+            u'Content-Type: text/plain; charset=UTF-8\n', 
             u'Content-Transfer-Encoding: 8bit\n',
             ]