Need to create email service provider using mail-server and IMAP protocol

Hello Everyone. This project is only for people who previously worked on Email Service. We start a website , where student can apply for different Universities in USA, UK and South Africa. But the problem is , when student apply our overseas agent sent them emails. 60% of these students later directly contact overseas agencies or contact university's foreign representative. In between we loose our client base. So we want to make Email Service, Like Gmail or Yahoo Mail... where they can do all the thing like normal email [send, receive mails, sent and receive files ] service . But if any emails comes from any university or any agents , that we do not want our clients to see.... those email's address will get changed. Other emails address do not need to change. For example: Our mail domain is [login to view URL] ..... So our clients main will be client_id @ abc.com. ukeducation @ [login to view URL] is our overseas agent's email. If they sent email to our candidates, candidates will not going to see the real email. Maybe it will show like mail_random_name @ [login to view URL] . But they can still send email to them. using address mail_random_name @ random.com. the client , can send message to his friend or family normally ... and this time when they send or receive message , the email id will not going to change. What we need ?? 1. Email Service for 2000 users monthly. [ a frontend website like yahoo mail] 2. i. A Dashboard, where we can change/hide some users email . ii. It can also send email in bulk or one at a time to multiple clients or single client Budget :: Below showed budget in three levels completing full or part of the projects [ A: { 150 Front_UI + Email server + service setup time 1 week } or B: { 220 Front_UI + Email server + service setup + Admin-Dashboard time 10 days } or C: { 350 Front_UI + Email server + service setup + Admin-Dashboard + Student_Agency website 12days } or ] For details you can text us. Thank You Take Care