Hello,
I am a senior engineer with 9+ years of experience managing windows environment.
I have an excellent skills in Windows servers and Active Directory, and very good php skills.
I did something similar before (searching for user data in AD from php)
Finding current logged in user is one part of the project.
Then getting his email from AD is the 2nd part.
The way the code get implemented and its difficulty depend on your environment.
You web server, IIS, or Apatche?
And what version?