Get your selection of students.
Go to :
Start Page > System Administrator > Page and Data Management > Data Export Manager
Select "PowerSchool Data Sets", "Student Email" from the two drop downs. Then select the fields that you want in the export and hit next.
at this screen, you can select any filters, or just hit the next.
This screen asks the name and format of the export file, we suggest naming the file with a .csv appendage and using the "comma" delimiter as seen above.
Then just hit export and the file will be generated.