As a logged in wiki user, you can subscribe to wiki pages, i.e. you will get notified if this page changes.
Click the envelope button on the right side of the page:
In this case: https://lede-project.org/releases/start
You may get more than one email, but you will get at least one if there is a new release.
Example email:
Tested and working (at least for gmx email accounts. arcor doesn't seem to work)