Send Email From Another Users Mailbox. If you want to send from another account in your Account list youll use SendUsingAccount and select the account by index or by name. The mailbox appears in your Outlook Web App folder list.

These people are often called the delegate and the delegator respectively. Open Control Panel click on Mail and choose Show Profiles. Message 3 of 3.
You can use the Office365SharedMailboxSendEmail method of the Office 365 connector to send from a common shared mailbox.
In the new email message in Outlook click From and then click Other Email Address. Instead its saved to the Sent. Use it with the UniSent add-in from the same site. In the other persons mailbox select the message that you want to reply to on behalf of your manager.