Weird "Always BCC" behavior

[Google Code Exporter]

What steps will reproduce the problem?
1. Set "Always BCC" to some address (and restart Mail.app if necessary).
2. Compose an email and fill in some BCC recipients.
3. Send the e-mail.

What is the expected output? What do you see instead?
I expect that the e-mail will by sent with specified BCC recipients and the 
address from "Always BCC" will be appended to them.
Instead the BCC field is completely overwritten with "Always BCC" address - 
none of the intended BCC recipients gets the e-mail; the e-mail is saved in 
Sent folder without the original BCC recipients. This is a real problem when 
sending xmas cards for example...

What version of the product are you using? On what operating system?
I believe I am using version 1.0.6 on Mac OS X 10.6.5.

Please provide any additional information below.
No idea...

Original issue reported on code.google.com by [e-mail] on 25 Dec 2010 at 6:56

[Google Code Exporter]

I just verified this in Mail.app 4.4 (1082).

However, see Issue 98 - the "Always BCC" secret doesn't work in its given 
format for Mail.app 4.4 (1082).

Original comment by [e-mail] on 31 Dec 2010 at 12:25