Just as one data point, this looks great but there is no way I could use a web mail client for security reasons (as a security consultant, we use PGP a lot and need a local email provider). In the comments I see it only works with Google servers to boot. I'm not sure if this will ever be for me as well, but I'd love something like paying a small fee for a version of Thunderbird with one or more of these features patched in.