To send a Bcc email without filling in the "To" field, you typically need to include at least one recipient in the "To" field to avoid sending an email with an empty "To". However, if you want to send an email where recipients' addresses are hidden, you can use the Bcc field to include multiple recipients without displaying their email addresses to each other.
In most email clients, including Outlook, if you leave the "To" field empty, it may result in an email being sent with an empty "To" field, which is generally not allowed. Therefore, a common workaround is to include a generic email address or a group name in the "To" field, while adding all the actual recipients in the Bcc field.
If you want to show a group name like "Student List" instead of individual email addresses, you would typically need to create a distribution list or a contact group in your email client. Then you can use that group name in the "To" field, while still adding individual email addresses in the Bcc field. This way, recipients will see the group name in the "To" field and not the individual addresses.
Please check your email client’s specific features for creating groups and managing Bcc settings, as these can vary between different versions and platforms.