new IO::Adapter $map, $config;

config()
pcb()
incoming_message_header()
incoming_message_body()
incoming_message()
article_header()
article_body()
article_message()

modified to use incoming_message_header() incoming_message_body()
incoming_message() article_header() article_body() article_message().

use reply_message*() with $msg_args to copy the message if needed where
$msg_args = { always_cc => $maintainer } or
$msg_args = { recipient => $maintinaer } pertinently.

within prepare() method now to handle virtual domains properly.

relocating variable definitions in etc/src/

aling rule: e.g. use_XXX XXX_rules XXX_dir XXX_cache_dir

rename:
$recipient_limit -> $smtp_recipient_limit
$incoming_mail_dir -> $incoming_mail_cache_dir
$outgoing_mail_dir -> $outgoing_mail_cache_dir
$qmail_control_virtualdomains_file -> $qmail_virtualdomains_file

s/header_filter/article_header_filter/
s/header_rewrite/article_header_rewrite/
s/body_filter/article_body_filter/

s/subject_tag/article_subject_tag/

verify_XXX_* -> check_XXX

newly defined:
$use_digest_header_rewrite

removed:
$smtp_log_dir
$smtp_log_file