Related Clues:

• Sing loudly without inhibition
• Certain inbox filler
• In-box clutter, perhaps
• Computer in-box annoyance
• It's often deleted
• Being under a bridge
• Folklore being
• Cyber-junk
• Fish, in a way
• Net receipts?
• War fare?
• Foxhole entree
• Unsolicited e-mail
• In-box filler
• "The Three Billy Goats Gruff' meanie