External Senders Warning Messages with Exchange Online
Recently, the biggest problem in information security is phishing and all other email attacks such as spam that comes with malicious content.
The worst problem is the phishing attack, and now is the common security challenges that both individuals and companies face in keeping their information secure. This post focus on the external sender’s warning Messages with Exchange Online.
Whether it’s getting access to passwords, credit cards, or other sensitive information, an attacker uses email, social media, phone calls, and any form of communication they can to steal valuable data. Businesses, of course, are a particularly worthwhile target.
There are many ways to protect from phishing and other email attacks with Office 365 ATP, Ironscales, and other platforms. The bottom line is that we need to make every effort to prevent the entry of any malicious content and if so, to warn.
Exchange Online alone cannot protect all attacks and must be configured with other products that handle advanced email attacks.
But after all, once you’ve Exchange Online and you can use some capabilities, one of them is the Exchange Transport Rule (ETR).
If you’re familiar with ETR and know how to use the ETR, so there are many things that you can do with these rules.
It’s always good to remind your end-users not to open any messages or attachments from unknown and external senders.
Configure warning message
In Exchange Admin Center (EAC), go to Mail Flow and then to Rules
Next, add the information below to your Exchange Transport Rule.
- The recipient is located inside the Organization (optional, but recommended to check with a specific group first)
- The sender is located Outside the Organization.
Next, choose more options and add the disclaimer and text to the rule.
<p><div style=’border:solid #9C6500 1.0pt;padding:2.0pt 2.0pt 2.0pt 2.0pt’><p class=MsoNormal style=’line-height:12.0pt;background:#FFEB9C’><b><span style=’font-size:10.0pt;color:#9C6501′></span></b><span style=’font-size:10.0pt;color:black’> [EXTERNAL]<o:p></o:p></span></p>
The disclaimer text is based on HTML, and it adds a line to the email message and marks the message with yellow.
Once adding all the required information, choose Save and wait 45 minutes, and all emails from the external messages will have another warning message.