Never send your CC number in e-mail. Just call them up and provide over the phone.
***Edit - By call them up, I mean call up whom ever you are buying from to provide payment information. Never send in an e-mail even if the company is a known company that you've dealt with. I recently did this and learned the hard way. Company I've done business with dozens of times and I sent my CC for a parts order (for a car). 2 days later the bogus charges started to happen. I was suspicion on how that happened until the owner called me and apologized because they were hacked. Handful of customers CC #'s were taken and they tracked it back to them.
Editing it now...
Boise, ID
