Related Clues:

• Inbox buildup
• It's often filtered
• Modern means of relaying jokes
• Spam, sometimes
• Alternative to the post office
• Unstamped letters
• Some have worms
• Send with a click
• Inbox item
• Cyber-letters
• Inbox accumulation
• Messages that may contain emoticons
• Monitored communications?
• Filtered stuff
• Web missive