Version: unspecified (using KDE 4.6.3) OS: Linux Using Kontact version 4.6 rc1 here. Please see bug #274966. If you are a BCC addressee of an e-mail you will see not see any recipient mentioned in the 'To:' field of that e-mail. Not seeing any recipient mentioned in that field is very strange for users, because obviously the user received that e-mail. Leaving it blank only confuses the user, I thought it was a bug in KMail (which it is, even though it is not unintended behaviour). The headers of such e-mails apparently list 'undisclosed-recipients' as the addressees. I suggest that KMail also mentions this in the GUI, showing 'Undisclosed recipients' in the 'To:' field instead of leaving it blank. Reproducible: Always
*** This bug has been marked as a duplicate of bug 263587 ***