Related Clues:

• Sent a duplicate, briefly
• Up on things
• Paying attention
• Knowledgeable
• Sent duplicates to, briefly
• On top of things
• Up to date
• Sophisticated
• Observant
• Having knowledge
• Cognisant
• Having knowledge of
• Sent an e-mail to someone in addition to the main recipient
• Mailed a duplicate, for short
• Plugged in