It seems that some domains just kill the backend. For my work e-mail, and probably any other on the same domain, it returns HTTP 503 (service unavailable) after

It seems that some domains just kill the backend. For my work e-mail, and probably any other on the same domain, it returns HTTP 503 (service unavailable) after ~30s, and frontend is stuck at "Checking…" forever. Maybe our mailserver fights back the spammers somehow. :) Also, it kinda sucks that i can't send the query with Enter key, and i bet it sucks much more for eg. visually impaired users. Is there any particular reason you used bunch of <div>s instead of good old <form>?