I also have a similar question but I'm not an admin who has the power to go disable all external email warnings, I'm an end user for an engineering firm. I get a lot of emails from outside my company who are trusted email addresses. If I can't disable "Caution: eternal email" banner at the top of all emails, can I at least add the trusted email addresses to a list so those don't get flagged as 'external'? It's annoying as **** that such a huge portion of the readable space is taken up with a banner letting me know I have an email from outside my organization even though it's a known / safe email address. I just want to be able to read the message content, not stupid unnecessary warnings.
Thanks.
Kim