Sieve (RFC5228) mode

 
#
# Example Sieve Filter
# Declare any optional features or extension used by the script
#
require ["fileinto", "reject"];
#
# Reject any large messages (note that the four leading dots get
# "stuffed" to three)
#
if size :over 1M
{
  reject text:
Please do not send me large attachments.
Put your file on a server and send me the URL.
Thank you.
.... Fred
.
;
  stop;
}
#
# Handle messages from known mailing lists
# Move messages from IETF filter discussion list to filter folder
#
if header :is "Sender" "owner-ietf-mta-filters@imc.org"
{
  fileinto "filter";  # move to "filter" folder
}
#

MIME types defined: application/sieve.