Traditionally, an email alias (also called a proxy address) was used only for receiving emails. For example, if your primary email was [email protected], you could also have aliases like [email protected] or [email protected] pointing to the same mailbox. Emails sent to those aliases would land in your inbox, but you could not send emails from those alias addresses.
That has now changed with modern requirements. Microsoft has introduced the Send From Alias feature in Exchange Online, allowing users to send emails directly from their alias addresses. This makes it much easier to manage scenarios like:
Team members replying from a department address (e.g., [email protected]).
Users are consolidating multiple identities under one mailbox.
Simplifying communication without needing shared mailboxes.
Enabling Send From Alias in Exchange Online
By default, this feature is disabled. To enable it, run the following command in Exchange Online PowerShell:
Set-OrganizationConfig -SendFromAliasEnabled $True
![Send-from-Allias]()
It might take up to 60 minutes for this change to take effect in your tenant.
Once enabled, users can send mail from their aliases using:
Setting Up Alias Addresses
Before using this feature, aliases must be added to the user’s account. This can be done in the Microsoft 365 Admin Center:
Go to the user’s account.
Add the required alias addresses under the email section.
Once added, these aliases will appear automatically in Outlook on the Web.
Choosing the From Address in Outlook Web App
To select which alias to send from:
Open Outlook on the Web.
Go to Settings → Mail → Compose and reply.
Look for the Addresses to send from section.
Select the alias addresses you want available when composing emails.
After this, Outlook will let you choose the alias address when composing a new email. If you reply to a message received at an alias, Outlook will automatically send the reply using that alias address.
![Send-from-Allias2]()
It might take up to 60 minutes for this change to take effect in your mailbox.
✅ With this feature, Exchange Online now provides much more flexibility in managing identities, making it easier for users to represent multiple addresses without switching mailboxes.