- deleting it (my favorite)
- doing the action requested, and replying (and deleting, because your Sent Items now contains the history and your reply!)
- archiving immediately(and possibly deleting at a later date)
- saving (until the a later date when the topic/project is obsolete and deleting!)
You can tell I am focused on the delete if at all possible. I already pitch lots of email, but I do have to keep that CYA trail for work. (Who sent who what and when) Still, I found the discussion interesting.