When you use G Suite Sync for Microsoft® Outlook® (GSSMO) to add someone else's account to your Outlook profile for delegation, the account appears in Mail Folders underneath your own (you might have to scroll down or collapse your account to see it). If that person also grants you access to their mail, you can open their mail folders and read, delete, send, and reply to their messages.
Before you send a message on behalf on another person, you must add their email address to the From field:
1. Click Show From on the the Options tab at the top of the window where you compose the message.
2. In the From field, enter that person's email address.
Once you have entered the person's address, it shows automatically when you compose new messages. You must add it manually the first time, however.
Recipients will see that person's address in the message's From field. Messages you reply to on that person's behalf show them as sender, too.
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