require_short_url: some hosts require short URLs otherwise they redirect to a forbidden page
no_rewrite_wysijap: some hosts don't work with the URL rewriting wysijap/subscription bounce_max**: by default, we handle 100 bounce emails per process, with this option you can increase or decrease this value
urlstats_base64: to deactivate base 64 links
no_js_val: no AJAX subscription
allow_no_js: with Wysija, you can register with or without JavaScript. This option deactivates the JavaScript-less option which can be used by spammers