- **sender**
- Output all addresses from the *From* header that appear on
- any message matching the search terms, either one per line
- (--format=text), separated by null characters
- (--format=text0), as a JSON array (--format=json), or as
- an S-Expression list (--format=sexp).
-
- Note: Searching for **sender** should be much faster than
- searching for **recipients**, because sender addresses are
- cached directly in the database whereas other addresses
- need to be fetched from message files.
-
- **recipients**
- Like **sender** but for addresses from *To*, *Cc* and
- *Bcc* headers.
-
- This option can be given multiple times to combine different
- outputs. Currently, this is only supported for **sender** and
- **recipients** outputs.
-