Yahoo and spams

[ddaas]

Hello everybody ! We have a lot of clients that have yahoo e-mails. Yahoo accept e-mail from our server but by default sort them as spams. What could it be? Does anyone know what does yahoo like or dislike? They don't have words related to spams, they are not advertisment etc. Related the keywords I think no system could sort the emails as spams. There should be something else. I post the header from such a e-mail (from yahoo): >From Myname Fri Feb 13 07:53:19 2009 Return-Path: <myaddr...@mydomain.ro> Authentication-Results: mta301.mail.mud.yahoo.com  from=mydomain.ro; domainkeys=neutral (no sig) Received: from 80.96.x.x  (EHLO mail.mydomain.ro) (80.96.x.x)   by mta301.mail.mud.yahoo.com with SMTP; Fri, 13 Feb 2009 07:53:21 -0800 Received: from [192.168.0.2] (unknown [95.76.x.x])     by mail.mydomain.ro (Postfix) with ESMTPA id 5779CAEBB3     for <em...@yahoo.com>; Fri, 13 Feb 2009 17:53:00 +0200 (EET) Message-ID: <4995976f.5000...@mydomain.ro> Date: Fri, 13 Feb 2009 17:53:19 +0200 From: Myname <myaddr...@mydomain.ro> User-Agent: Thunderbird 2.0.0.19 (X11/20090105) MIME-Version: 1.0 To: em...@yahoo.com Subject: test Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Length: 1735 Thanks Dan