Send ccAddrs to smtp as RCPT TO addresses (#24)
Send ccAddrs to smtp as RCPT TO addresses (#24)

rfc5321 says:
> It is recommended that the UA provide its initial ("submission
> client") MTA with an envelope separate from the message itself.

see https://tools.ietf.org/html/rfc5321#appendix-B
domodwyer/mailyak,domodwyer/mailyak