Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More
This thread was archived. Please ask a new question if you need help.
Solved Archived

Why is my sent to recipient labeled UNDISCLOSED?

Thunderbird Other
car-nuts replied
spaceraven
spaceraven

I sent an email for an address in my book with a copy to myself. The email I received had this recipient marked as Undisclosed. When I checked so did the sent email. Even though I am the author I cannot it appears Unmasked this recipient. What occurred and can I unmask to verify who got it?

I sent an email for an address in my book with a copy to myself. The email I received had this recipient marked as Undisclosed. When I checked so did the sent email. Even though I am the author I cannot it appears Unmasked this recipient. What occurred and can I unmask to verify who got it?

All Replies (3)

Zenos
Zenos

That sounds rather like what should happen if you had set both addressees to use "Bcc:". Do you think that is possible?

If you're using gmail, then you won't see the Bcc'd addresses in your Sent folder either. Google choose to redact them.

spaceraven
spaceraven Question owner

Chosen Solution

Actually close. Think I figured it out. Apparently when there is No Recipient and only a BCC or maybe a CC, Thunderbird plugs in that false Undisclosed Recipient as a default. Not really an accurate default imo. The clue is that it was so identified on my sent message, not just the copy I got back. Thanks

car-nuts
car-nuts

In my case I found this issue was related to double entries in the sent file, Haven't solved it yet: https://support.mozilla.org/en-US/questions/1183704