I don't know of any product that does exactly this. I was surprised to read that Tovaris does PGP as well as S/MIME, since I have never read that and couldn't find it on their Web page. Let me suggest a couple of resources for you and ask a few questions for you to consider. What is your requirement? Digitally signed e-mail so that the recipient can know that it came without modification from your company? Encryption all the way to the end user? Encryption while over the public Internet? A competitor of Tovaris is Cipher Trust. I wrote a review of IronMail in this month's Information Security Magazine. Dave Piscitello and I wrote an article about other solutions you might find interesting. It is in the same magazine, different issue. I wrote a column that is not directly applicable, but close. But again, I have not heard of a solution that combines user transparency and the ability to use both PGP and S/MIME certs. I'd be interested to hear if you find anything.
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