in src/main/java/org/apache/log4j/net/SMTPAppender.java [164:189]
protected void addressMessage(final Message msg) throws MessagingException {
if (from != null) {
msg.setFrom(getAddress(from));
} else {
msg.setFrom();
}
//Add ReplyTo addresses if defined.
if (replyTo != null && replyTo.length() > 0) {
msg.setReplyTo(parseAddress(replyTo));
}
if (to != null && to.length() > 0) {
msg.setRecipients(Message.RecipientType.TO, parseAddress(to));
}
//Add CC receipients if defined.
if (cc != null && cc.length() > 0) {
msg.setRecipients(Message.RecipientType.CC, parseAddress(cc));
}
//Add BCC receipients if defined.
if (bcc != null && bcc.length() > 0) {
msg.setRecipients(Message.RecipientType.BCC, parseAddress(bcc));
}
}