The internal e-mail address, is generally the user's official e-mail address, whereas the external e-mail address can be the user's official e-mail address or a personal e-mail address like Gmail, Yahoo Mail, Hotmail etc. that is convenient for the user to access anywhere (Some organizations limit official e-mail access to within their network only).

An external e-mail address is mainly used for two reasons:

  • Offline Timesheet
  • Offline Expense Sheet

Related Items:

Understanding Offline Timesheet & its benefits.