Acho que você pode usar my_hdr
para isso:
my_hdr Cc: <my@email>
Se você quiser que isso salve seus e-mails, use record
:
This specifies the file into which your outgoing messages should be appended. (This is meant as the primary method for saving a copy of your messages, but another way to do this is using the '' my_hdr'' command to create a Bcc: field with your email address in it.)