(0 or 1) When USE_HEADER_FROM =1, this option controls whether or not a Reply-to: or Resent-reply-to: header line is considered for use as the SMS source address. By default, Reply-to: and Resent-reply-to: header lines are ignored. This corresponds to an option value of 0. To enable consideration of these header lines, use an option value of 1.
Note that RFC 2822 has deprecated the use of Reply-to: and Resent-reply-to: header lines.