Office365 group’s member cannot send email as group’s email account

office-365outlook-365

How can a user send email as the assigned group's shared email account?

More detail:

Our company has an office365.com account.

User someone@company.com is a member of a group with info@company.com shared mailbox.

But someone@company.com cannot send email as info@company.com. In fact, there is only the main email address someone@company.com in the From combo-box of the user.

Best Answer

If you spend a minute searching, you will find all the articles are how Send As permissions should work with Office 365, Exchange Online and Outlook 2016. We read them all and were still getting (despite checking and re-checking permissions):

This message could not be sent. You do not have the permission to send the message on behalf of the specified user.

With the error code:

0x80070005-0x000004dc-0x00000524

The solution was to:

  1. Go into the Exchange admin center (EAC) > recipients > shared
  2. in the shared mailbox, check "Hide from address lists"
  3. Save
  4. Wait for change to propagate

  5. Go back in and clear the "Hide from address lists" checkbox

  6. From Outlook, add the address as a "From" addres.

  7. Account Settings > Account Settings > Email > the Exchange account > More Settings > Advanced > Add -- add the shared mailbox name.
  8. In Accounting Settings > Download Address Book > download the Global Address List

May need to restart Outlook.

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