Secretly send a dupe email to

• Email letters
• Covertly email
• Secretly address an email to: Abbr
• Include covertly, briefly
• Stealthy email letters
• Letters in front of an e-mail address
• Include secretly, as in an email
• Abbr. at the top of an email
• Include discreetly in an email, for short

Wiktionary Word definitions in Wiktionary
init. 1 body-centered cubic 2 blind carbon copy vb. to send something by blind carbon copy