How to send to multiple email addresses without showing gmail

Using the BCC feature to send your message can help maintain a recipient's privacy. By including a recipient in the BCC line, their address remains hidden from all other recipients in the To, CC, and BCC fields.

To send emails to small groups where everybody knows each other, use the Cc field. Enter all of the addresses there, separated by commas. To hide addresses, use the Bcc field, just like the Cc field. No one will be able to see the addresses added in this field.