Click New and open drop down menu.
Type “Undisclosed recipients” under Full Name.
Type your email address under E-mail.
Click Save and Close.
To send an email to multiple but hidden recipients with “Undisclosed recipients” in the “To” field:
Click new email message. Click the “To” button.
Highlight Undisclosed recipients.
Click To ->. Highlight all people in your address book to whom you want to send the message.
Click Bcc ->.
Add any additional recipients’ email addresses to the “Bcc” field.
Separate addresses with semicolons.
Compose your message and click Send.