I just got insta-banned from suggesting edits whilst not logged in* and got a message saying:
You are temporarily banned from suggesting edits - please review your edit history.
The link, which is...
http://$site/users/current?tab=activity&sort=suggestions
...leads nowhere (or actually redirects to the homepage) if you aren't logged in (and as far as I know there's no way for anonymous users to see their edit history?).
* I suggested two edits anonymously (in another browser, whilst not logged in). The first was a genuine edit to my own answer, which I instantly accepted (in the browser in which I was logged in); interestingly, the "system" marked it as possible spam. The second was a long edit of nonsense (Lorem ipsum to be precise), which on submitting sent me directly back to the post and silently disregarded the edit. On trying to submit another edit I got the message above.