You do not have to login every time you visit, as unless you manually LOGOUT, clear your cookies or use a different device or browser on your next visit, the website should ‘remember you’ for the following 30 days at least.
So please ensure the ‘Stay logged in’ box is ticked to stay logged in on your browser for up to 30 days:
If you are still having an issue, please consider trying a different browser. If you are using a VPN or ad-blocker, please try turning them off to see whether it makes a difference.
If you have the "Stay logged in" box unchecked or use some extension that deletes cookies, you are expected to be logged out after a visit to the site.
If you use multiple devices or multiple email applications that open the e-newsletter links in multiple browsers you would need to log-in to all of them.