Copying/Moving Emails to Separate Folder or Matter(s)

Is there a way to copy emails such that they are in more than one folder or more than one matter, like you can do with documents? I understand that you can re-tag an email such that it will move to a different matter, but

1.  what if an email covers more than one matter and you want it assigned to both matters. 
   1. Example - email is from client with two separate matters and needs to be attached to both Matter 1 and Matter 2
2. Also, what if you want the email assigned to a specific subfolder? 
   1. For example - email includes a settlement offer from opposing counsel and you would like it to be saved in the Settlement subfolder 

You can do this with documents so easily - I would think you should be able to do the same with emails.