Include secretly, as in an email

• Secretly address an email to: Abbr
• Secretly include, maybe
• Include so other recipients don't know, briefly
• Discreet way to be included on an email, for short
• Stealthy email letters
• Covertly email
• Include invisibly in an email
• Include in the email secretively
• Private email attachment, briefly

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