'Only show whose own email after sending email to multiple recipients

I sent the mail to multiple recipients but when I show the mail box's 'Recipient', there is shown the multiple recipients.

I want the mail box's Recipient to show only whose own email after sending mail to multiple recipients.

I have tried change the Message.RecipientType.TO -> Message.RecipientType.BCC

but it was hide all of recipients.

How could resolve it?

    msg.setFrom(new InternetAddress("[email protected]", "test account"));
    msg.setRecipients(Message.RecipientType.TO, toClient);
    msg.setSubject(title);
    msg.setContent(content, "text/html; charset=UTF-8");


    Transport trans = session.getTransport("smtp");
    trans.connect();

    try {
        trans.sendMessage(msg, toClient);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        trans.close();
    }
emailsmtp


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