What do you guys think about not storing, or at least not displaying the s/mime signature that can get attached to a discussion.

I automatically sign all my email. So my discussions look like:

http://support.tgethr.com/discussions/questions/15-identity-verifications

And we've had users ask, what's the "smime.p7s" file, and how do I open it? For the web interface, this just causes confusion.

Tgethr (http://tgethr.com) is something we created to do simple group collaboration over email. It's very similar in some ways to Tender here in that it's very "emaily". We use it a lot to do private discussions over our Tender support requests, and we talk about our use of Tender a lot when we talk about reasons why we made tgethr (http://blog.tgethr.com/post/124643305/get-tgethr)

And when we save attachments, we drop any attachments that are signatures

attachments.reject{|a| a.content_type.index("signature")}

Kind of thing. We use the sigs to verify mail coming in though, we just don't keep the sig around.