[Dovecot] spamassassin, postfix with dovecot lda?

[George Mamalakis]

Hi all,

I am trying to setup a mail server using postfix (virtual_mailboxes), 
spamassassin and dovecot, along with SQL where appropriate. From my 
research so far I realized that, for several reasons, it is required for 
me to use dovecot LDA instead of maildrop, local, procmail or other 
alternatives.

My configuration was working flawlessly, until spamassassin per-user 
configuration came to play. If I just wanted an MTA anti-spam gateway, I 
could directly call spamassassin via master.cf, or through some helper 
"content-filter-application" (like amavis or amavisd-new), and 
everything would work just fine (I tried and tested many such 
configurations with success). But when antispam per user preferences 
became my concern (Bayesian filters and classifier), I realized that 
spamd should be called by the LDA. With procmail this was a trivial 
issue, with dovecot-lda I was unable to find any solution on the web or 
other documentation.

So my question is as follows:
    Is there a way to call spamc from dovecot-LDA (and/or 
dovecot-sieve), or is there an alternate way to do this for a site with 
virtual mailboxes configured with dovecot-lda?

Thank you all in advance,

regards,

-- 
George Mamalakis
IT Officer, 
Department of Electrical and Computer Engineering,
Aristotle Univ. of Thessaloniki, Greece