[FIX] ir.mail_server: be more lenient when validating From address

When a user has their email as name, the system will
construct the From header as "email<email>".
We previously forbade this, because the naive
check only counts the number of emails in
the From header.
We might need to drop that assert or implement
something better in the future.

bzr revid: odo@openerp.com-20130910143809-wu32dkz20es579nv

openerp/addons/base/ir/ir_mail_server.py

@@ -402,7 +402,8 @@ class ir_mail_server(osv.osv):
 
         # The email's "Envelope From" (Return-Path), and all recipient addresses must only contain ASCII characters.
         from_rfc2822 = extract_rfc2822_addresses(smtp_from)
-        assert len(from_rfc2822) == 1, "Malformed 'Return-Path' or 'From' address - it may only contain plain ASCII characters"
+        assert len(set(from_rfc2822)) == 1, ("Malformed 'Return-Path' or 'From' address: %r - "
+                                             "It should contain one plain ASCII email") % smtp_from
         smtp_from = from_rfc2822[0]
         email_to = message['To']
         email_cc = message['Cc']