The BCC field itself is usually removed from the email but if you're monitoring ... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

		_3u10 on June 27, 2013 \| parent \| context \| favorite \| on: New leak shows NSA harvests To, From, and Bcc line... The BCC field itself is usually removed from the email but if you're monitoring the STMP session you can reconstruct the BCC from the RCPT TO commands in SMTP.

ape4 on June 28, 2013 [–]

Yes if somebody is in the RCPT TO but not the To: or other fields then they are Bcc:

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact