If you are synchronizing an Office 365 account with an on-premises Active Directory, you know that you cannot edit exchange user properties using the Office 365 administrator portal. In this article, I will show you how to add e-mail aliases using the Active Directory Service Interfaces Editor (adsiedit).
- Go to Start > Run and type adsiedit.msc
- Now, find the unit where your AD user’s reside
- Right click the user you want to edit and click Properties.
- Find the variable proxyAddresses – this is the one you want to edit.
When you add new e-mail aliases, you want to make sure that your primary e-mail address will start with upper-case SMTP. Your aliases, aka, secondary addresses should be lower-case smtp.For example, I want my primary e-mail address to be firstname.lastname@example.org
In the proxyAddresses attribute, I would put:
As my alias, I want email@example.com… to do this, I will use lower case smtp:
Apply the new settings and wait for your active directory to be synchronised with Office 365 (by default this happens every 3 hours)