What is the right way to list "cc" on a letter-the original letter is being sent via mail, and copy via email?

I need to know the appropriate way to put "cc" on a letter which is typed on letterhead and sent via mail, with a copy being sent via e-mail.
What is the right way to list "cc" on a letter-the original letter is being sent via mail, and copy via email?
It is the very last entry on the page and 2 lines below the name.





cc: John Jones





This is from a guidebook





cc: Stands for courtesy copies (formerly carbon copies). List the names of people to whom you distribute copies, in alphabetical order. If addresses would be useful to the recipient of the letter, include them. If you don't copy your letter to anyone, skip it.


搂
Reply:VIA EMAIL ONLY


Mr.____________


BLAH company


Blah Address


State, NJ


Re: Blah Blah Blah


Dear Blah:





cc: Mr. Blah Blah Blah, Via Email Only
Reply:Sincerely,





(4 spaces here)





(Your name here) John Smith


(I believe 2 spaces go here)


cc: Joe Brown