Category: e-mail...

email through your PDA or phone
emailing the President of the United States
promptly answered emails
an "I love you" email
sending text, graphics, and sometimes sounds and animated images
The difference between e-mail and regular mail is that computers handle e-mail, and computers never decide to come to work one day and shoot all the other computers. (J. Cascio)
Anyone wishing to communicate with Americans should do so by email, which has been specially invented for the purpose, involving neither physical proximity nor speech. (A. Waugh)