looking for email expert to deliver emails to hotmail

We are looking for an experienced/expert email provider to enable us to send emails to hotmail server successfully. Email are being delivered to most providers except hotmail and facebook. What we have: An operational education website with integrated registration and membership panel. We have a dedicated server running on Linux. We send registration confirmation emails that a user needs to open to activate all new registrations. Currently we don’t send emails via SMTP but it can be configured if seem desired. However, we have already tried sending emails using SMTP but to no avail. Registration Confirmation emails are sent to yahoo/ google and other hosts properly but hotmail doesn’t accept emails from our domain. We have successfully registered with hotmail’s JMR program (Junk Email Reporting) and our IP is supposedly white-listed now We tried, using the same scripts, to send emails from different domain name and it worked well. Our emails are not sent to Spam folder but are bounced from hotmail server automatically. What we need done: To find out “why” exactly our emails are rejected by hotmail server. To verify if our IP or domain name is blacklisted anywhere. To help us establish an emailing route to ensure smooth delivery to hotmail and other major hosts. You will not have access to live server but we can do any tests/codes that might be needed. Review and comply with Windows Live Hotmail's technical standards - This information can be found at [login to view URL] Please start your bids with “JMR Expert” so to make sure you have read the details. Our website can be seen here: [login to view URL] Our own tech support and our webhosting provider [login to view URL] have without success tried to solve the problem.." We are on a very strict deadline and payments will be released ONLY if you are able to deliver this within your delivery date.