Send As vs Send on Behalf of in Microsoft 365

In Microsoft 365, you can assign permissions to a mailbox or group so that other users can send email messages that appear to come from the mailbox or group. This feature is useful when you want to delegate the email communication for a specific role or function to someone else. For example, you can allow your assistant to send emails on your behalf, or you can let a team member send emails as a group.

There are two types of permissions that you can assign for this purpose: Send As and Send on Behalf.

Here are the main differences between them:

Send As

Messages sent by a delegate appear to come from the mailbox or group. The recipient will not see any indication that the message was sent by someone else. For example, if John Smith has Send As permission on the Sales group, and he sends an email as the group, the email will look like it was sent by Sales.

Send on Behalf

Messages sent by a delegate have "<Delegate> on behalf of <Mailbox>" or "<Delegate> on behalf of <Group>" in the From address. The recipient will see both the delegate's name and the mailbox or group name in the message. For example, if Jane Doe has Send on Behalf permission on the Marketing group, and she sends an email on behalf of the group, the email will look like it was sent by Jane Doe on behalf of Marketing.

To assign these permissions, you need to be a global or Exchange administrator in Microsoft 365. You can use the Exchange admin center (EAC) or Exchange Online PowerShell to assign these permissions to individual users or mail-enabled security groups. 

For help setting this up, just reach out to our service delivery team!

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