require ["vnd.dovecot.pipe", "copy", "variables"];
if address :matches :all ["to", "cc"] ["john*@example.com", "nospam@example.com"] {
    if header :matches "from" "*" { set "from" "${1}"; }
    if header :matches "subject" "*" { set "subject" "${1}"; }
    pipe :copy :try "xmpp-headline.sh" ["${from}", "${subject}"];
}