Why Does hotmail still reject my emails?

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http://serverfault.com – I have a very strange problem with my emails being marked as spam by hotmail. I just have configured Postfix + Dovecot on my server and all works perfectly. I can Send/Receive emails. I only have problems with hotmail accounts, I do not understand the reason, because I also configured: SPF DKIM rDNS My IP is not listed in any backlist, I used: mxtoolbox.com Checking the headers I see that SPF and DKIM pass correctly. I have no problem with GMAIL, YAHOO, and other, but hotmail seems very strict. The only problem I think... could be that my IP had no email traffic yet. I've sent very few em (HowTos)