Hello, I am running a Postfix server in a dedicated server in a Linux environment (centOS 5.3) for a social networking web application and are experiencing deliverability issues with Hotmail (I can send mails to Gmail, Yahoo, Aol in inbox). I only send legit mails for registered users (notifications). I have SPF, DK and DKIM setup. I pass the Sender ID test when mailing to [email protected] but we have "X-Auth-Result : None" only in Hotmail headers and no X-SID-Result:Pass. We have been enrolled in their program for more than 2 weeks and normally when you apply to their Sender ID program you are supposed to have X-SID-Result:Pass and X-Auth-Result:Pass. I contacted Hotmail about the issue and they told me that my domain looks like added to Sender ID in their system this is beyond their support and asked me to contact my ISP. As you can imagine, my ISP has no clue about that either. I don't really know what could be wrong... Mails are currently filtered as spam and we would like to be able to have them landing in inbox.