Sending carbon copy mails from R

updated code pasted here. So I guess CC is not an option at all? In that case
is there any other package that would be useful?

require(sendmailR)
to <- c("v.n at abc.com")
header <- list(cc=c("a.j at abc.com"))
x <- sendmail("toto at abc.com", to, "test", "testing",
header=header,control=list(smtpServer=server,verbose=TRUE))
<< 220 equity.xyz.com ESMTP Sendmail 8.11.7p1+Sun/8.11.7; Thu, 11 Jul 2013
21:31:43 -0400 (EDT)

HELO  HKD03836654

<< 250 equity.xyz.com Hello HKD03836654.gbl.ad.net [169.34.175.142], pleased
to meet you

MAIL FROM:  toto at abc.com

<< 250 2.1.0 toto at abc.com... Sender ok

RCPT TO:  v.n at abc.com

<< 250 2.1.5 v.n at abc.com... Recipient ok

DATA

<< 354 Enter mail, end with "." on a line by itself

<message data>

<< 250 2.0.0 r6C1Vh101169 Message accepted for delivery

QUIT

<< 221 2.0.0 equity.csfb.com closing connection



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