Add or remove a user's email alias

As an Office 365 admin, you can add additional email addresses to your user's accounts by creating an email alias. For example, if customers have questions, they can email info@contoso.com instead of sally@contoso.com, which looks much more professional. The user who is using this email address as their alias will get the email directly in their inbox. When they reply to the mail; however, they will reply with their primary email address.

Your people will still use the same email address to sign in.

Note: If you want your people to reply with the email address info@contoso.com instead of sally@contoso.com, we recommend that you Create a shared mailbox.

Add email aliases to a user

You must have admin permissions in Office 365 to do this.

Sign in with your Office 365 admin account on the Office 365 admin center.
Select Users.
On the Active users page, choose the user.
Next to User name / Email, choose Edit.

Important: If you've just created or licensed this user, you can't add an email alias until the user's email is fully provisioned. It can take up to 30 minutes.
On the Edit email addresses page, in the text box under Alias, type the first part of the new email alias. If you added your own domain to Office 365, you can choose the domain for the new email alias by using the drop-down list. Then choose Add.

Note: The email alias must end with a domain from the drop-down list. To add another domain name to the list, see Adding additional domains to Office 365.
When you're done, choose Save.
Wait 24 hours for the new aliases to populate throughout Office 365.

The user now has a primary address and an alias. All mail sent to sally@contoso.com and info@contoso.com will go to Sally's Inbox.
When the user replies, the From address will be her primary email alias. For example, let's say a message is sent to Sales@Contoso.com, and it arrives in Ina's inbox. When Ina replies to the message, her primary email address will appear as the sender, not Sales@Contoso.com.

Remove an alias from a user

You must have admin permissions in Office 365 to do this.

Sign in with your Office 365 admin account.
Select Users.
On the Active users page, choose the user.
Next to User name / Email, choose Edit.
Remove the alias by selecting the remove icon, and then select Save and Close.

For more information please visit https://support.office.com/en-us/article/add-or-remove-a-user-s-email-alias-cb86b53b-bebf-4e0a-b781-c49270d85ea3.

Knowledgebase