[sylpheed:32559] server side filtering?

[Tobias Crefeld]

Meanwhile I have a lot of rules for filtering or "verarbeitung" (don't
know what it's called in english localization) of folder filters which
works fine so far. 
Only the filtering rules of the folders of some IMAP-accounts are
running pretty slow in comparison to the local maildirs. 

Is there a way to move the filtering, especially the sorting of mails
onto the server? It's a Courier-IMAP with Postfix as MTA under Linux
(Suse 10.1). Most of the rules look for sender addresses or list-tags
in SMTP-headers or use "age_greater".

TIA!

-- 
Gruß,
 Tobias.