Subject - search only in the subject line of the email message
Body - search only in the main body of the email message
From - search only in the From field of the email message
To - search only in the To field of the email message
Cc - search only in the carbon copy field of the email message
Bcc - search only in the blind carbon copy field of the email message
Other header - search in any other headers that are not covered by the above options. This includes all x-headers. You can either search in all other headers, or define a specific header that you want to search.
