Here, we need to mention the other prerequisite. And since we want to configure this for a shared mailbox, OWA is actually the better choice here, as it’s easier to access a shared mailbox from within OWA. At the time of writing, Outlook still does not support configuring which aliases you can use for sending (I’m using version 2208 on the Semi-annual channel), so you have to head over to OWA for this step. Once the feature has been enabled, you are free to use it, but not without some additional configuration first. If you need to toggle the feature on, you can do so again from PowerShell or the EAC UI: Set-OrganizationConfig -SendFromAliasEnabled $true This is an admin-level operation, performed via PowerShell ( Get-OrganizationConfig) or the EAC UI (go to Settings > Mail flow or directly here). There are certain prerequisites though, so let’s go over them step by step.įirst, you need to make sure that the Send As Alias feature is enabled for your tenant. Not sure if this has been available since the introduction of the Send As Alias feature in Microsoft 365 a while back, but it turns out you can actually use the feature with Shared mailboxes too.

Open shared mailbox owa