Make Apple blind-copy (Bcc) every message

From a posting on
defaults read UserHeaders

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

defaults write UserHeaders ‘{“Reply-To” = “”; }’


defaults write UserHeaders ‘{“Reply-To” = “”; “Bcc” = “”; }’

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

defaults delete UserHeaders

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

Leave a Reply

Your email address will not be published. Required fields are marked *