A PowerShell menu script that will help you to:
TEST + implement the process of – Bulk add additional Alias E-mail addresses with a specific Domain name suffix, to multiple Exchange Online mailboxes.
In case that you want to get more detailed information about the subject of – adding additional Alias E-mail address, you can read the articles:
- Adding Email addresses using PowerShell | Office 365 | Part 3#13
- Adding Email addresses using PowerShell – Bulk mode | Office 365 | Part 4#13