There's some legal that the boss would like added to all outgoing e-mail. Without creating a signature and relying on users to remember to add it to their e-mail, can all outgoing e-mails have a signature appended to their e-mail?
There are a few ways to do it.
You can push out a script via group policy to generate a signature on the client machine and then force its use - assuming you are using outlook. There are some downfalls to this method
There are some 3rd party solutions that will do this for you, exclaimer and codetwo exchange rules come to mind.
Exclaimer is quite involved, I've used codetwo exchange rules and find it excellent.
You can try codetwo's software for free (it'll put a link to their website at the bottom until you license it).
Failing that most SPAM filtering will have this feature depending on your requirements.