It's not possible to keep a permanent copy of your email address in the clipboard history because after you restart (shut down) yours system, the clipboard history will be wipe. You can try finding another program that has a larger clipboard memory. Regarding this matter, you can take a look at Paster or Super Copy Paste.
In Kopypasta application, the active status mark the text which is active at a specific moment and will be pasted first. The inactive status mark the piece of text that is currently inactive but can be used.