Make Apple Mail.app blind-copy (Bcc) every message

From a posting on MacUpdates.com:
defaults read com.apple.mail UserHeaders

This will return “The domain/default pair of (com.apple.mail, UserHeaders) does not exist” if you have none set)

defaults write com.apple.mail UserHeaders ‘{“Reply-To” = “theemail@goes.here”; }’

or

defaults write com.apple.mail UserHeaders ‘{“Reply-To” = “theemail@goes.here”; “Bcc” = “another@address.here”; }’

You can add as many headers as you like in this format. And finally,

defaults delete com.apple.mail UserHeaders

To get back to the default. Note that this doesn’t give you an input box in Mail.app – Should it do?

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