Can anyone suggest a webmail provider (like gmail, Yahoo mail, hotmail, etc.) that supports S/MIME encrypted email well? Both sending and receiving email and obviously keeping track of the encryption keys for contacts.
I haven't found one yet that appears to support S/MIME and I'm thinking a hosted Exchange account might be my only option. Any thoughts? Thanks!
I've found the Gmail S/MIME plugin to work just great. Yes, it requires you to use Firefox with a plugin, but if that's not a big deal, it should work fine for you.
Additionally, S/MIME is really a client-side thing. You could use Thunderbird (or any other decent MUA) with any of these services and be able to send and receive S/MIME messages just fine.
I'm not sure you'll find any public ones, since decryption/encryption uses too much CPU and storing private keys in a public service isn't good thing to do. Hosted Exchange will be the best.