Surely, though, it must be possible to send the same email to more than one recipient — with all the additional receivers hidden from each other. Using the Bcc: line (and separating multiple addresses with semicolons in it), you can. In Yahoo! Mail, you just have to reveal that line.
Add Bcc: Recipients to an Email in Yahoo! Mail
To send a message to Bcc: recipients from Yahoo! Mail:
- Start with a new message by clicking the New button or pressing n.
- Click Show Bcc (at the To: line's right end).
- Type the desired recipients' email addresses in the Bcc: field or click Bcc: to select addressees from your Yahoo! Mail address book.
- For the message to be correctly composed, an address needs to appear in the To: field. You cannot fill just the Bcc: field. If you want no To: recipient visible to all others, you can put your own Yahoo! Mail address in the To: field.
- Continue composing your message.
Add Bcc: Recipients to an Email in Yahoo! Mail Classic
To send a message to hidden Bcc: recipients in Yahoo! Mail Classic:
- Click Compose to start a new message.
- Click Add BCC (above the To: line).
- Type the desired recipients' email addresses in the Bcc: field or click Bcc: to select addressees from your Yahoo! Mail address book.
- Your message also needs needs at least one addressee in the To: line. If you want no recipient to be visible, you can enter your own Yahoo! Mail address in the To: field.
- Continue composing your message.

