Give mailbox permissions to another user in Office 365 - Admin Help

As the Office 365 admin, you may have company requirements to allow some users access to another user's mailbox. For example, you may want to enable an assistant to send or read email from their manager's mailbox, or one of your user's the ability to send email on behalf of another user. This topic shows you how to accomplish this.

If you're looking for information about creating and managing shared mailboxes, check out Create a shared mailbox.

Send email from another user's mailbox

  1. Go to Office 365 admin center > Users > Active Users.

  2. Choose the user you want, and then click on Edit next to Mailbox permissions.

  3. In the search box under Send as, type the name of the user or users that you want to allow to send email from this mailbox.

  4. Once you've selected your users, click Save.

Screenshot: Allow another user to send email as this user

Read email in another user's mailbox

  1. Go to Office 365 admin center > Users > Active Users.

  2. Click or tap on the user you want, and then click or tap on mailbox permissions.

  3. In the search box under Read and manage email to this mailbox, type the name of the user or users that you want to allow to read email from this mailbox.

  4. Once you've selected your users, click Save.

Screenshot: Add users to read and manage this user's mailbox

Send email on behalf of another user

  1. Go to Office 365 admin center > Users > Active Users.

  2. Choose the user you want, and then click or tap on Edit next to Mailbox permissions.

  3. In the search box under Send on behalf, type the name of the user or users that you want to allow to send email on behalf of this mailbox.

  4. Once you've selected your users, click Save.

Screenshot: Allow another user to send on behalf of this user

Send and read from Outlook and Outlook on the web for business

Want to know how to send email from another user's mailbox? Check out the following topics:

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