How to enable sending emails as an alias in Microsoft 365 and Exchange and creating rules for filing

The ability to send from proxy addresses or secondary aliases on a mailbox has long been demanded by Exchange account users. For many years, accounts could send using these proxy addresses, but the option had not yet been added to Office 365 business mailboxes.

Not any longer…

When you use an alias to send an email, it will be maintained in the recipient’s From and Reply to fields. Your alias will be displayed to the recipient instead of your actual email address.

Enable Send Email from Alias Office 365

The send from alias option is turned off by default, so if you want to use this feature you will need to enable it in the Exchange Online Admin center or with PowerShell.

  1. Open the Exchange Admin Center
  2. Click Settings > Mail flow
  3. Enable Turn on sending from aliases

Once done, you can use mail flow rules (also known as transport rules) to identify and take action on messages that flow through your organization.

Mail flow rules take action on messages while they’re in transit, not after the message is delivered to the mailbox. Mail flow rules contain a richer set of conditions, exceptions, and actions, which provides you with the flexibility to implement many types of messaging policies.

Want to learn more? Watch the video below…