Gmail's new confidential mode lets its users create "expiration dates" for emails, or require recipients to provide an SMS passcode. (And Google also claims they've removed the option to forward, copy, download or print messages.)
But Slashdot reader Lauren Weinstein warns that Google is also opening up a new vector for phishing emails: The problem arises since non-Gmail users cannot directly receive Gmail confidential mode messages. Instead...when a Gmail user wants to send a non-Gmail user such a message, the non-Gmail user is instead sent a link, that when clicked takes them to Google's servers where they can read the confidential mode message in their browser.
The potential risks for any service that operates in this way are obvious. Those of us working on Internet security and privacy have literally spent many years attempting to train users to avoid clicking on "to read the message, click here" links in emails that they receive. Criminals have simply become too adept at creating fraudulent emails that lead to phishing and malware sites.