Fix Emails send to hotmail but not get in inbox or junke

we have PHP form to send emails for email verfication all emails providers are getting our emails, but hotmail is not getting we have try every option we change our DNS and we track the emails it was sent and delivered, but all users have hotmail they never get any email from our website, we used STMP in our php mailer still hotmail not getting our emails, if you have any serious solution to get our emails really in users inbox, then please contact us