Permissions are required in any context to access the resources and services for maintenance/sanity check purposes, compliance purposes, and, sometimes, for central administration.
With Office 365 mailbox architecture, it has 3 different types of permission where we can;
Access Other’s Mailbox
Send Email on Someone’s behalf as Send-As or Send-on-behalf.
Breakdown of Office 365 Mailbox Permission Types
Full Access Permissions
People with full access permissions can access the mailbox completely. You can assign these permissions to a user mailbox or a shared mailbox. This can be done through the Graphical User Interface [GUI] from the Exchange Admin Center or through the PowerShell Command.
The full access permission lets a user log into the shared mailbox and act as its owner. While logged in, the user can create calendar items, contacts, and tasks and read, view, delete, and change email messages. However, users with full access permissions cannot send emails from the shared mailbox unless they have Send As permission.
Send As Permissions
People with this access can view and reply/send messages under their personal account, unlike full-access users who can send messages under their shared mailbox identity. You will usually want to enable this permission. The Send As permission lets a user impersonate the shared mailbox when sending mail.
For example, if Mary logs into the shared mailbox sales@acme.com and sends an email, it will look like the sales department sent it.
Send on Behalf Permissions
Allows the delegate to send messages from the mailbox or group. The From address of these messages clearly shows that the delegate sent the message.
However, replies to these messages are sent to the mailbox or group, not the delegate. Doesn't allow the delegate to read the contents of the mailbox. If you assign the Send on Behalf permission to a mailbox hidden from address lists, the delegate won't be able to send messages from the mailbox.
Sending a message as, or on behalf of, a person
To send a message as, or on behalf of, a person, proceed as follows.
From within Outlook, click New Email.
A new Message window opens, with your email address in the From field.
In the new Message window, click, From, and select the required sender email address from the list of sender email addresses shown.
3. If the required address is not shown, then:
Click Other E-Mail Address.
The Send From Other E-Mail Address dialogue box appears.
In the text box, start typing the required email address.
Enter the address that requires permission and send the email.
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