When you preview an email, it's always a great idea to check that your links work.
For example, click on a couple of your property thumbnails to make sure they correctly link to your website or landing page.
It is important to note however, that certain links (and placeholders) will not work in preview mode, as they are only activated in a live send, when connected to your database.
A good example of this is your Unsubscribe link. As this generates a unique identifying link for each contact in your database, clicking on your unsubscribe link when you "View Preview or "Send Preview" will not work.
If you have any concerns or further questions around the functionality of your links, please contact our support team and they'll be happy to assist you.