http://ssd.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/ps/module/how-avoid-phishing-attacks
So, instead of allowing every image to load in every email all the time, it’s best to set your email client—whether that’s an app like Outlook or a service like Gmail—to “Ask before displaying external images.” With this option set, you will need to click an option in every email to load images. Some email apps may also offer other privacy measures, like Apple’s Mail app, which loads all images remotely by default.