diff --git a/addons/mail/static/src/css/mail.css b/addons/mail/static/src/css/mail.css
index 8261478319a..9d317f714d7 100644
--- a/addons/mail/static/src/css/mail.css
+++ b/addons/mail/static/src/css/mail.css
@@ -83,14 +83,3 @@
 .openerp .oe_mail .oe_msg.oe_msg_read .oe_read{
     display:none;
 }
-
-.openerp .oe_mail .oe_msg_last {
-    border-bottom: 5px solid black;
-    border-left: 2px solid black;
-    border-right: 2px solid black;
-}
-.openerp .oe_mail .oe_msg_first {
-    border-top: 5px solid black;
-    border-left: 2px solid black;
-    border-right: 2px solid black;
-}
\ No newline at end of file
diff --git a/addons/mail/static/src/js/mail.js b/addons/mail/static/src/js/mail.js
index 7603490ded5..6d8f31c9ac7 100644
--- a/addons/mail/static/src/js/mail.js
+++ b/addons/mail/static/src/js/mail.js
@@ -1124,11 +1124,6 @@ openerp.mail = function(session) {
                 }
             }
 
-            self.$('.oe_msg_first:first').removeClass("oe_msg_first");
-            self.$('.oe_msg_last:last').removeClass("oe_msg_last");
-            self.$('.oe_msg_comment:first, .oe_msg_comment:first-child').addClass("oe_msg_first");
-            self.$('.oe_msg_comment:last, .oe_msg_comment:last-child').addClass("oe_msg_last");
-
             return message
         },