Include secretly, as in an email exchange
Else clues• Abbr. atop some e-mails
• Abbr. on top of some e-mails
• Bring into the conversation, quietly
• E-mail add-on
• Include discreetly
• Include discreetly on an email
• Include in an e-mail without other recipients knowing
• Include invisibly in an email
• Letters in front of an e-mail address
• Montgomery County H.S.
• Quietly forward
• Secretive e-mail abbr.
• Secretly e-mail