Automatic BCC'ing with KMail

One must-have feature (for me) in any mail client is the ability to automatically BCC an address with outgoing mail. I use this to log all my outgoing mail so that

1. I can verify that mail was sent, for troubleshooting purposes.
2. I can have a record of my correspondence in case I ever need to show that, yes I did send that email I said I sent last week, thankyouverymuch. Having mail in a sent folder on my own system doesn't really do that -- it'd be trivial to edit the mailbox on my own system.

I've found that most mail clients support this -- but many make it hard to find the option.

In case you're wondering where to find this in KMail, it's under Settings -> Configure KMail. Then go to Identities and click the Modify button. It's under the Advanced Tab, shown here.

Hope that helps!