About: 

HPG utilizes banners in email to help employees identify risks associated with email-based attacks that put themselves and the computer at risk. These banners are dynamic and there may be several prepended to a message at time. Employees should take additional cautions on messages containing banners. 

If a message is received that has a reply-to and sender do not match the following banner will be displayed on the message:

Image -shows caution banner

Process

1. NetSuite, CommonSku, and occasionally some other services may show this banner. Report any message delivered from these sources that appear to be suspicious.
2. Inspect links before clicking them
3. If the message is from or includes an unknown domain or contact, report it as suspicious