Following up on this because I asked the question again in a new thread a few hours ago.
1. The library referenced by Gene appears to be the commons-jelly-tags-email.jar and is utilized by referencing the email:email tag.
You DO get cc, bcc, and attach support for this; however, you DO NOT get html support.
2. I still don't know the location of the library for gel:email. It would be interesting to see where that library/class exists and what it contains. With the email:email, you do have to provide your server info within the tag. Easy enough, but gel:email does not require.
3. gel:email does not support cc, bcc, or attachment, but it DOES support html.
So, it would be nice to find the location of the gel:email library, and see if there is a way to merge the two.
(Considering deleting my thread from before)
Thanks.