This morning when I logged into Gmail, I noticed Google was displaying a warning message when I viewed the daily digest email from Our Life + Dogs.
Click through to see the full size.
This warning message is appearing because my website runs on a blogging platform called WordPress. One of the nice features about WordPress is that it has various plugins that can do things like automate notifications such as the daily digest email. When it sends the email, the email is made to look like it’s coming directly from me to you, even though it’s actually being handled automatically behind the scenes in software.
Google appends various authentication factors in the emails that are sent directly from Gmail to another user, but my mailing list plugin does not. When Gmail detects that the authentication token is missing, it generates the warning you see in the screenshot above.
This is perfectly normal, expected behavior! Gmail is doing its job in trying to protect you from what may be malware (but in this case, actually is not).
If you don’t want to see the scary yellow warning bar in the future, you can follow the troubleshooting steps in this Gmail help document.