sendmailR: Submit encoded message to local SMTP server

I need your help in order to send email message that includes text in Greek, from within R, using the function sendmail {sendmailR}.

I tried using the function iconv, like that but it didn't work

subject <- iconv("text in greek", to = "CP1253")
sendmail(from, to, subject, msg, control=list(smtpServer="blabla"))

The mail arrives immediately but the greek characters are unreadable. Any ideas?

EDIT

Another question that came up: The second argument to accepts one recipient. What if want to send it to more than one? (I think 'll try sapply ing the sendmail function to a vector of recipients) - Ok, that worked. However, I'm not completely satisfied because each one of the recipients has no way to know who else has received the message.