Email not sending to hotmail. Possibe to use SMTP?

[rekuen]

I have many servers who deliver successful to Hotmail
But i must agree Hotmail has his own rules and sometime they block without a reason
1.Make sure you have a clean IP address
2.Check rDNS settings
3.if possible use DKIM
5.Do not use Email Forwarders, this triggers Spam protection by providers

 1.Checked, not blacklisted, VPS static IP.
 2.Checked, rDNS resolves fine to the same domain.
 3.Checked, all accounts have DKIM keys, one by one, no *@example.com , only to the real email accounts that are created. Also using SPF generated from Microsoft Wizard.
 4. Not fowarding at all.

Same result.