Send from an Alias – Shared Mailbox

Say you have your primary email james@example.com and an alias info@example.com

If you want to send as info@example.com you need to "Configure Exchange Online to Send from Aliases" (see below)

Caveats

With a Shared mailbox sending from an alias only works in Outlook Web Access

If you normal Exchange Online Mailbox has aliases you can send from your Outlook Desktop Client and OWA

Powershell

1 2	`Connect-ExchangeOnline` `Set-organizationconfig` `-SendFromAliasEnabled` `$true`

Or using the ECP

Choose Settings on the left pane in the Exchange Admin Panel

Select Mail Flow

Check "Turn on sending from aliases"

Save