diff --git a/surveillance/arpwatch_sendmail.py b/surveillance/arpwatch_sendmail.py
index 9de455b7..634b88d6 100644
--- a/surveillance/arpwatch_sendmail.py
+++ b/surveillance/arpwatch_sendmail.py
@@ -21,21 +21,29 @@ def get_machine(unformated_mac):
 
 if __name__ == "__main__":
     texte = sys.stdin.read().decode('ISO-8859-15')
+    textes = texte.splitlines(True)
+    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-Transfer-Encoding: 8bit\n',
+            ]
+
     # On récupère les destinataires dans les arguments (très ad hoc)
     recipients = sys.argv[2].split(',')
     # On complète le message
     try:
         macs = find_mac.findall(texte)
         for mac in macs:
-            texte += get_machine(mac)
+            textes.append(get_machine(mac))
     except:
         # En cas d'exception, on envoie le traceback
         import traceback
-        texte += u'\n'
-        texte += u''.join(traceback.format_exception(sys.exc_type, sys.exc_value, sys.exc_traceback))
-    texte += '\n-- \narpwatch_sendmail.py\n'
+        textes.append(u'\n')
+        textes.append(u''.join(traceback.format_exception(sys.exc_type, sys.exc_value, sys.exc_traceback)))
+    textes.append('\n-- \narpwatch_sendmail.py\n')
 
     smtp = smtplib.SMTP()
     smtp.connect()
-    smtp.sendmail("arpwatch@crans.org", recipients, texte.encode('ISO-8859-15'))
+    smtp.sendmail("arpwatch@crans.org", recipients, u''.join(textes).encode('UTF-8'))
     smtp.quit()