Dovecot LDA has been working fine for me but when I tried to follow the wiki and switch to LMTP I get:

Recipient address rejected: User unknown in local recipient table;

In postfix/main.cf I went from: mailbox_transport = dovecot-spam to mailbox_transport = lmtp:unix:private/dovecot-lmtp

Added this: service lmtp { unix_listener /var/spool/postfix/private/dovecot-lmtp { group = postfix mode = 0600 user = postfix } }

protocol lmtp { mail_fsync = optimized postmaster_address = postmaster@domainname mail_plugins = sieve zlib }

And some other pertinent parts of the config:

passdb { args = /etc/dovecot/passdb driver = passwd-file } passdb { driver = pam }

protocol lda { mail_fsync = optimized auth_socket_path = /var/run/dovecot/auth-master deliver_log_format = msgid=%m: %$ mail_plugin_dir = /usr/local/lib/dovecot mail_plugins = sieve zlib postmaster_address = postmaster quota_full_tempfail = yes rejection_reason = Your message to <%t> was automatically rejected:%n%r lda_mailbox_autocreate = yes }