AhaBulbStuff Everyone Should Know
AhaBulb: Stuff Everyone Should Know · ahabulb.com/email-bcc

If you are BCC'd on an email and hit 'Reply All', who gets your reply?

Only the original sender and the people in the To and CC lines.

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  1. Everyone, including other BCCs
  2. Only the original sender
  3. The sender and the To/CC lines ✔

Why: BCC stands for Blind Carbon Copy. Your email program cannot see the other BCC addresses, so it cannot send your reply to them.

Huh, didn't know that: If you reply all to a BCC, the people in the To and CC lines will suddenly know you were secretly copied.

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Why did the email fail art class? It had no attachment.
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References

Answer: The sender and the To/CC lines. BCC stands for Blind Carbon Copy. Your email program cannot see the other BCC addresses, so it cannot send your reply to them.

  1. Microsoft Support: Reply to or forward an email message support.microsoft.com/en-us/outlook/reply-to-or-forward-an-email-message
    Reply all sends the new message to the original sender and all other recipients on the To and Cc lines.
    Checked 2026-10-09.
  2. Microsoft Support: Show, hide, and view the Bcc field in Outlook for Windows support.microsoft.com/en-us/outlook/mail/show-hide-and-view-the-bcc-blind-carbon-copy-field-in-outlook-for-windows
    If you're the recipient of a message, you can't see whether the sender added Bcc recipients.
    Checked 2026-10-09.

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