Put automatically in BCC some emails

[Cadey]

Hello

Customer asked me if it was possible to put an address automatically in blind copy for every emails going out. Any clue?

For instance : boss@domain.com should be in BCC for every mail going out through the SMTP server.

Also is it possible to set this option on a "case" basis?
For instance I only want that emails sent from user "user1@domain.com" to be blind copied to "boss@domain.com"

Thanks for your help!