I got this in my email today.
Dear user of the on.nachi.org mailing service!
We are informing you that because of the security upgrade of the mailing service your mailbox (email@example.com) settings were changed. In order to apply the new set of settings click on the following link:
Best regards, on.nachi.org Technical Support.
I modified the above address so it won’t go anywhere. When it originally was clicked on all these warnings popped up that this was not who they claimed they were. Be careful.