Need to create email services like Gmail or Yahoo

Hello Everyone. This project is only for people who previously worked on Email Services. We start a website, where students can apply to different Universities in the USA, UK, and South Africa. But the problem is when students use our overseas agent to send them emails. 60% of these students later directly contact overseas agencies or contact the university's foreign representative. In between, we lose our client base. So we want to make an Email Service, Like Gmail or Yahoo Mail... where they can do all the things like normal email [send, receive mails, sent and receive files ] service. But if any emails come from any university or any agents, that we do not want our clients to see.... those email addresses will get changed. Other emails address do not need to change. For example: Our mail domain is [login to view URL] ..... So our client's main will be client_id @ abc.com. UK education @ [login to view URL] is our overseas agent's email. If they sent emails to our candidates, candidates will not go to see the real email. Maybe it will show like mail_random_name @ random.com. But they can still send emails to them. using address mail_random_name @ random.com. the client can send messages to his friend or family normally ... and this time when they send or receive a message, the email id will not going to change. What do 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 emails in bulk or one at a time to multiple clients or a single client Budget:: Below showed budget for three levels completing the whole or part of the projects [ A: { 150 Front_UI + Email server + service setup time 1 week } or B: { 250 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