Problem
When clicking on a page, subpage, or a block link in an email, you get the following error message:
Solution
You need to enable the secret link feature before exporting your document into an email.
In case your document contains block links, make sure to enable the Visitors Can Follow Block Links option.
Note: retroactively enabling the secret link won't change the results. Once you enabled the secret link feature, you need to export the content once again.