Mail No attachment, body only -

mailx -m -s "Some Subject" somone@somewhere.com < file_for_email_body

Mail with attachement, no body -
                                                                        
ux2dos /path_to/some_file | uuencode some_file.txt | mailx -m -s "MAIL FROM Someone" someone@somewhere.com

Mail with attachment and body -

ux2dos /path_to/some_file | uuencode some_file.txt | mailx -m -s "MAIL FROM Someone" someone@somewhere.com < file_for_email_body

Mail with carbon and blind carbon -

mailx -m -s "Some Subject" somone@somewhere.com < file_for_email_body

(the file_for_email_body should look like this - )
~c someone_to_cc@somewhere.com
~b someone_to_bc@somewhere.com
The remainder of this file is the text body of the email.