Send mail as a shared mailbox

Hello Colin,

What permission did you assign? From the error message, it seems that you only assigned the Full Access permission, so you can add the shared mailbox to your account and view the emails, but you are not able to send the emails as the shared mailbox.

Please sign in Office 365 and go to Exchange Admin Center(EAC)->recipients->shared, click and edit the shared mailbox. Then go to mailbox delegation, add your account to the Sent As permission list. Then wait a few hours to take effect. Then you will be able to send emails as the shared mailbox. In Outlook 2016 client, click From and choose Other Email Address and type the address of the shared mailbox.

Regards,

Rick

Hi Rick,

This is what I saw when I followed your instructions:

To me, it looks like the Send As permission is already set. Should I delete the permissions and re-add them?

Peace & Blessings,

Colin+

[PII removed by Rick Song MSFT, 6:58 AM, April 8, 2018(UTC)]

Hello Colin,

Sorry for the late reply as I was off-duty before.

You can try to remove and re-add your account, and wait a few hours to see if it takes effects. Besides, you can also manage the permission in Office 365 Admin Center->Groups->Shared mailboxes, then click and edit the shared mailbox, click Customize permissions.

If the issue persists, please follow the instructions below to add send as permission using PowerShell:

1 . Connect to Exchange Online PowerShell.

2 . Run the following cmds: Add-RecipientPermission -Identity sharedmailbox@domain.com -AccessRights SendAs -Trustee “xxx@domain.com”

It will add xxx@domain.com send as permission of the shared mailbox. If the issue persists after you added it using PowerShell, please capture a full screenshot of the new error message. And then run the following cmds:

1 . Get-MailboxPermission -Identity sharedmailbox@domain.com

2 . Get-RecipientPermission -Identity ****

Then paste the full results via private message for further check. Please also let me know which mailbox is your account. To protect your privacy, I have sent you a private message to collect them. Please click on the link below to access your Private Message : https://answers.microsoft.com/en-us/privatemessage/inbox

Regards,

Rick

Hello Colin,

From the screenshot in private message, we can confirm that you have add your account the “Full Access” and “Send As” permission to the shared mailbox. I suggest you follow the instructions below to send emails as the shared mailbox:

In Outlook Web App(OWA):

1 . Sign in OWA and on the OWA navigation bar, click your name, click Open another mailbox.

2 . Type the email address of the shared mailbox, click Open.

3 . Then it will open the shared mailbox in a separate browser window. Then you can send emails using the shared mailbox.

In Outlook 2016 client:

1 . After you have the correct permission of the shared mailbox, the shared mailbox will be shown automatically under your account.

2 . Click new email and click the From.

3 . Choose Other Email Address and then type the address of the shared mailbox. Then you will be able to send emails from the shared mailbox.

If you still can not send the emails using the shared mailbox, please capture a screen of the new error message for further check.

Regards,

Rick

Hi Rick,

It works in OWA, but not Outlook 2016. I've sent another private message with the details.

Peace & Blessings,

Colin+

Hello Colin,

On my side, after I added the Full access and Send as permission, I can send and receive emails successfully both in OWA and Outlook client.

Based on the error message, you may need to add your mailbox the Send on behalf of permission to resolve this issue in Outlook client. There are two ways to add the Send on behalf of permission.

1 . Go to Office 365 Admin Center->Groups->Shared mailboxes, then click and edit the shared mailbox, click Customize permissions. Add you mailbox to the Send on behalf of permission list.

2 . Run the following PowerShell cmds: Set-Mailbox -Identity sharedmailbox@domain.com -GrantSendOnBehalfTo @{Add=”xxx@domain.com”}

After add the permission, you may need to wait a few hours to let it take effect. Then test it again in Outlook 2016 client. If the issue still persists, would you mind please upload the full error message again via private message for further check?

Regards,

Rick

Hello Colin,

May I know if it works know?

Regards,

Rick

Hi Rick,

Still no luck with the Outlook app -- and still works online with OWA.

I haven't had the time to pay the error messages yet.

I even deleted the accounts from Outlook and re--added them with no difference.

Hello Colin,

Thanks for your reply. As you can send emails from OWA successfully, it means that you have added the permission successfully, and the problem you encountered looks a bit strange. Can you please upload the new full error message via private message for further check?

And also, I have to collect some more information:

1 . The version number of your Outlook client. Click Help->About Outlook.
2 . May I know if this shared mailbox is shown automatically in Outlook client now?

3 . I suggest you set up your account on another device to see if you can send emails via the shared mailbox. If it works on another device, the issue should be related to the Outlook client.

Regards,

Rick

Hello Colin,

I'm writing to follow up the thread. Is there any update for further assistance?

Regards,

Rick