diff --git a/openerp/addons/base/ir/ir_mail_server.py b/openerp/addons/base/ir/ir_mail_server.py
index 04156411e48..971fd6596ce 100644
--- a/openerp/addons/base/ir/ir_mail_server.py
+++ b/openerp/addons/base/ir/ir_mail_server.py
@@ -396,7 +396,7 @@ class ir_mail_server(osv.osv):
                  MailDeliveryException and logs root cause.
         """
         smtp_from = message['Return-Path'] or message['From']
-        assert smtp_from, "The Return-Path or From header is required for any outbound e-mail"
+        assert smtp_from, "The Return-Path or From header is required for any outbound email
 
         # The email's "Envelope From" (Return-Path), and all recipient addresses must only contain ASCII characters.
         from_rfc2822 = extract_rfc2822_addresses(smtp_from)