I'm trying to do phishing mitigation in the Outlook desktop app, and I've seen a number of cases where the display name is so long that the email address gets truncated, e.g.
From: Microsoft email account activity notifications [email protected]
might get truncated in the view pane to
From: Microsoft email account activity notifications <[email protected]
which looks at least superficially legit.
Is there a way to ensure that the full email address is displayed? Yes, I know that users can mouse over the email address to see who the email is from, but I want to eliminate barriers to good email security.
Ideally, I would like to set this in a GPO.
I think you could try adding a custom form configuration file in the following guidance to your client so that there will be a column displaying the sender's email address in the message list:
Show sender’s e-mail address as a column in the Message List
My test result in the following screenshot is for your reference:
If the sender's email address is a bit long, you could change the Reading Pane to bottom:
Besides, if you want to block the emails from the phishing sender, you could create an inbox or transport rule: