...
Staff Email Address
staff.user@staffemail.apu.edu.my
staff.user@apu.edu.my
staff.user@apiit.edu.my
Students Email Address
...
When you send an email to staff any of the above addresses would work and they are all considered valid.
...
All newly joined students (2016 onward) can only use the email address with the domain “mail.apu.edu.my” only.