Airmail has built-in auto-BCC support!
Click on Airmail » Preferences... in the menu bar. A window will appear, and should be focused on the “Accounts” tab.
Click on the gear icon beside the account you want to track in Clockk. You probably want to do this for all your email accounts.
Go to the “Composer” tab. Under “Auto Sent Mail”, choose “Auto BCC” and enter your
...@secure.clockk.com email address in the field to the right.
You‘re all done! Send an email, and you’ll see a line appear in Clockk’s Activity view a few seconds later.
Remember: Clockk only tracks the email from, to, cc, subject, and date. Everything else from the email is discarded.