Red ‘External Email’ Header Update: What You Need to Know Now more than ever, it’s increasingly difficult to spot fake or misspelled email addresses created to trick people into thinking they’re receiving messages from familiar companies, partners and vendors. 2. This warning that we receive for external emails send to us is to try and prevent phishing emails being successful. All email originating from outside the university, except for approved services, will be tagged with this [EXTERNAL] message. Internal Message Subject Example: "Meeting today at 3:00pm" External Message Subject Example: Watch for email senders that use suspicious or misleading domain names. A back and forth email conversation would have the warning prepended multiple times. This short guide shows you how to create a mail flow rule that marks any inbound external emails with an "External Email" warning for end users. If you can’t tell if an email is legitimate or not, please [INSERT COMPANY PROTOCOL]. Most email scams begin with messages from an external email system. Be especially cautious when opening attachments or clicking links if you receive an email containing a warning banner indicating that it originated from an external source. From now on, when clicking Send button to send emails to external email domain (not the internal email domain you specified in the VBA code), a warning … Please change it as you need. What happens though is that when we reply to the email the banner from the original email stating that it is external is still visible. Note: In the code, “ @addin99.com ” is the internal email domain you will send emails to. External Email Warning Hi, I've just added an external email warning to all emails not coming from within our organization and I'd really like to be able to change the color on that. How to configure warning messages for Office 365 emails from external senders As a security precaution, it’s a good idea to remind your staff not to open attachments from unknown senders. Re: Displaying a warning message when sending emails to external recipients with attachements @Gurdev Singh - This is now supported in AIP preview client v 1.48.1.0, config details are Implement pop-up messages in Outlook for email or attachments with AIP label . See sample below: The Outlook email list preview shows the warning message for each external email rather than the first line of the message like they're used to. Many safe and legitimate email messages come from external email systems and the [EXTERNAL] tag does not mean the message is a scam or malicious, only that recipients should take caution and read carefully. As part of the University of Iowa's effort to reduce phishing and other email scams, these external email messages will now receive an [External] tag in the message subject. 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