And this user should really use drafts instead which are exactly for 
his purpose and should restore BCCs correctly.

Given that Bcc's are meant to be protected from dissemination as much 
as possible, it is best just to keep the current behavior since it is 
the "safer" alternative.

I agree that replying shouldn't pick up bccs.

I reported the "bug" because we have one user who used the message in 
sent mail to send to the same group of people by choosing Reply to All 
and then editing the message. This worked in IMP 3.x so I reported the 
"bug".



This particular user was convinced to use a Turba Contact List instead 
and nobody else has complained about the BCC issue.



As for the question if BCC addresses should be passed on to the 
Compose window, either way works for me. :-) I don't expect it is a 
big issue in our user base if the current behavior is not altered.

I don't agree with this.  This results in behavior that is not 
reproducible between folders (when you reply-to-all in every other 
folder, you get the auto-added Bcc addresses set in your identity) 
and, to me at least, Bcc's are kind of a one-shot thing - they 
shouldn't be accessible in future mailings.  We only store the Bcc in 
the sent-mail folder to give the user the ability to determine exactly 
who they sent a message to.



Other thoughts?

Fixed in our installation using idea from Ticket #2558 :



###### Fix to allow BCC to be filled in properly when clicking "Reply 
All" from a message in sent-mail



--- compose.php.orig    2007-02-12 11:29:24.000000000 -0400

+++ compose.php 2007-02-12 09:15:58.000000000 -0400

@@ -1497,7 +1497,7 @@



  /* If this is the first page load for this compose item, add auto BCC

   * addresses. */

- if (empty($reloaded) && ($actionID != 'draft')) {

+ if (empty($reloaded) && ($actionID != 'draft') && empty($header['bcc'])) {

      $header['bcc'] = MIME::addrArray2String($identity->getBccAddresses());

  }

If you have a message in sent-mail folder that had BCC addresses in 
when sent originally and you click "Reply tp All", the BCC filed is 
blank.