Should I capitalize the "i" in Internet and use a hyphen in e-mail?
The Internet is a proper noun. In the English language, almost all proper nouns begin with a capital letter. Therefore, when referring to the Internet, a global interconnected network of computers, always capitalize the first letter. It should be noted that the word inter-network means a network of a few computers; it does not require capitalization.
Short for electronic mail, the spelling of e-mail is widely accepted as both e-mail and email. However, according to Merriam-Webster and other authorities, the correct spelling is e-mail because it is the compound of the words electronic and mail.