Related Clues:

• Secretly kept in the message loop, for short
• Secretly included, in a way
• Sent secret messages to, in a way
• Looped in secretly, in email
• Included covertly in an email
• Tagged surreptitiously, as on an email
• Secretly looped in on an email convo
• Secretly included on an email
• Covertly added to an email