1. You should always have a subject line or else you look stupid.
2. You shouldn’t or else the person you forward it to will have a long list of emails.
3. You shouldn’t because then everyone will get and see your reply.
4. You should because cc is where they the person that you sent it to can see that you CC’ed it to someone and that someone dosen’t need to respond.
5. You shouldn’t because then everyone will know that you were bcc’ed because otherwise it is hidden.
6. You should because then someone will see it so they can easily reply and you may put it in the signature.
7. You shouldn’t because then everyone will get a list of all the other people you sent it to.
8. You shouldn’t because chain mail is dumb.
9. You shouldn’t because you will end up taking lots of space so you should just link them.
10. You should because keeping your friends privacy is key.
