Changing LDA to dovecot deliver

[RJDavison]

I've running a web server using Sendmail, Mailscanner, Spamassassin having followed this tutorial.....

bio.fsu.edu/~sysalex/freebsd-mail-server.htm

I've also installed Dovecot as IMAP

I want to be able to use Dovecot as my LDA so that I can use the Sieve filter (with Managesieve).

My question is, how do I change my LDA to dovecot deliever ?

I can find tutorials for Sendmail, but none with Mailscanner and spamassassin, which is confusing me.

I'm also not too sure which LDA i'm using at the moment - i'm guessing its mail.local ??