The parts of the URL following the ? are GET parameters. I don't know what they mean and they are going to be specific to the site application. The site your connecting to is secure (https) which I suspect is because it is performing authentication. Following that, it appears that you are going to be redirected to an insecure page (continue=http
. This makes sense from Google's standpoint a secure page requires more resources on their end.
If you want a more secure email, consider using something else, like hushmail that operates via an HTTPS page.