I am creating emails from scratch and pasting the HTML into a new email within Marketo. For unsubscribe and view in browser, I am using these links as obtained from the Resource Docs (below). However when I send a test email the links are broken (they do not click through), and in preview mode they come up as "Bad Server Request." When I check the box in settings to include the View in Browser link, it does work. However I have a "View Online" link in my design I'd like to utilize instead. Thank you!
View in Browser: %mkt_webview_url%?mkt_tok=##MKT_TOK##
there is a section in the admin panel called email where you can enter you opt out language. You should try entering this content in those pre-configured areas.
You can add system tokens to your template in an anchor tag to make this work the way you want.