dovecot - Sep 2010 - sieve rules quiestion (deduplicate e-mails)

Hello. I'm successful use sieve for filtering e-mail from various
subscriptions.

But if i have subscription for 2 or more mailing lists and user write
email to list1 at xxx.org and list2 at yyy.org by REPLY TO ALL or make a CC
header, i'm recieve email twice, if i reply in some list to user and
user REPLY TO ALL - i'm recieve email 3 times :)

How can i'm eliminate this duplications? For example i want to recive
all emails, but put only one in subscription folder. And other silently
discard....


And second question is - i have many subsections to mailing lists, sieve
rules looks like this:

elsif header :contains "List-Id" ["cfe-dev.cs.uiuc.edu"] {
    fileinto "Subscriptions/Clang";
}
elsif header :contains "List-Id"
["jabberd2-lists.xiaoka.com"] {
    fileinto "Subscriptions/Jabberd2";
}
elsif header :contains "List-Id" ["chef.lists.opscode.com"]
{
    fileinto "Subscriptions/Chef";
}
elsif header :contains "List-Id"
["help-cfengine.cfengine.org"] {
    fileinto "Subscriptions/Cfengine";
}
# rule:[Exherbo]
elsif header :contains
"List-Id"
["exherbo-dev.lists.exherbo.org","exherbo-commits.lists.exherbo.org"]
{
    fileinto "Subscriptions/Exherbo";
}
# rule:[Php]
elsif header :contains
"List-Id"
["highload-php-ru.googlegroups.com","highload-php-en.googlegroups.com"]
{
    fileinto "Subscriptions/Php";
}
# rule:[Btrfs]
elsif header :contains ["List-Id"]
["linux-btrfs.vger.kernel.org"] {
    fileinto "Subscriptions/Btrfs";


How can i minimize this rules and save desired functionality? 

-- 
Vasiliy G Tolstov <v.tolstov at selfip.ru>
Selfip.Ru