Related Clues:

• It might be spam
• Computer message
• Modern posting
• Post sans postage
• Spammer's medium
• Write without pen or pencil
• Online memo
• Place for an emoticon
• Call alternative
• Cyberspace note
• Correspondence sans stamp
• It doesn't leave a paper trail?
• Virtual inbox fill
• It may come with attachments
• Moves like the Road Runner