[Dovecot] sieve unresolved problem

hello, I have submitted a few weeks ago problem on sieve implementantion but there not useful solution for me at this time. I think that it depend on my mail architecture : _One NFS server _two dovecot POP/IMAP server (for pop and webmail access) : the POP/IMAP don't run dovecot LDA _two delivery serveur with exim and dovecot LDA : they communicate with external relay servers and deliver mail in box.

The mailbox format is maildir and the dovecot version is 1.0 rc2 Question : On which server and how to implement sieve for dovecot.

Regards

Amadou TOURE