Create a Wordpress Plugin

I want a wordpress plugin - email client with following functions: > Read, compose, check all email folders and other email functions which have in gmail through wordpress plugin > front end user /admin / group manager login > Create group of users like sales, HR, billing group for emails. Group manager can see his group's all mails in list and check mail of his department's users. See the picture attached. > User can not see all list of users. He can see only his user name when login. > Admin can see list of all users and check all group and users mail. > Admin can give right to auto forward email and other settings to users or group managers, but by default users can only read and compose their own emails. > Customize login branding and other branding in sidebar as in picture shown. > group manager can write / compose mail to entire group or individual. Similarly admin can... > other mailing funcationlities and settings