I created an email server hosted at IP 18.104.22.168 with domain www.softmail.me using which I can send and receive emails from all users and I don't have problem with any other except hotmail. That my emails are moving to Junk bin of hotmail. How to overcome this issue?
You server/domain is probably missing some configurations that helps prove that you are not a spammer. Other mail servers have various checks in place to qualify what is spam and what is not. Many of these spam checks add details to the headers of an e-mail message which could clue you into what Hotmail may be flagging your e-mails on. I would recommend sending yourself an e-mail to a Hotmail address from your server and read through the headers (look for an option to view the message source when you have an e-mail message open).
A few examples of configurations that will cause such problems include the following: