Filter standard input into mailbox format. Useful for splitting mail digests or passing the contents of a mail file to another program such as a spam filter for additional processing. If no sender is apparent, provide the sender foo@bar. By default, escape bogus From lines with >.
Do not split first skip messages.
Stop after splitting total messages.
Append headerfield to header, unless it already exists. If headerfield is Message-ID or Resent-Message-ID with no contents, generate a unique message ID.
Do not escape bogus From lines.
When header fields are more than one line long, concatenate the lines.
Do not assume that input must be in strict mailbox format. This option disables recognition of the Content-Length field so you can split digests or use nonstandard mailbox formats
Allow messages to begin one immediately after the other; do not require empty space between them.
Do not edit non-mailbox-format lines. By default, formail prepends From to such lines.
Append headerfield whether or not it already exists. Rename each existing headerfield to Old- headerfield, unless it is empty.
For use only with -r. Keep the body as well as the fields specified by -r.
Require at least minfields before recognizing the beginning of a new message. Default is 2.
Allow simultaneous formail processes to run.
Escape lines with prefix instead of >.
Do not display ...