The best place to share an important statement is usually in the body of the email itself. This allows recipients to read the update in a quick and easy way without having to click on any links or buttons and be redirected elsewhere.
However, the announcement might simply be too long to include in the text of an email, or you want to provide additional information in a location where it can be found permanently rather than getting lost in an inbox. In any of these cases, it would be a good idea to send a message with an attached document or a link to the must-read news posted on your website, blog, or social media platforms.