Discreetly keep in the email loop, for short

• Secretly loop in
• Keep apprised, in a way
• Send covertly, as an email
• Secretly keep in the email loop, briefly
• Emailing option
• Discreetly include on an email
• Email sending option: Abbr
• Email option, briefly
• Abbr. at the top of an email

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