(last updated 2007-04-11) Header field name: Apparently-To Applicable protocol: mail Status: deprecated Author/Change controller: IETF Specification document(s): RFC 2076, section 3.4 Related information: This header field was never formally standardized. It was added by a popular mailer in absence of recipient header fields (To, Cc, Bcc) listing all envelope RCPT TO addresses, thereby disclosing the addresses of blind carbon copies to all recipients. Mentioned in RFC 1211 appendix F.18.a and RFC 2076 3.4, discussed in RFC 2821 7.2 (summary: "SHOULD NOT be used"), this was later copied verbatim into RFC 3552 6.1.1.2. (file created 2007-04-11)