SOLVED: does lda_save_to_detail_mailbox exist?

A. Schulze:

there is a nice feature in lmtp to save messages to user+foo@domain
in INBOX/foo Looks like that doesn't work as good if lda is used.

It works!

for some reasons I don't follow the suggestion on
http://wiki2.dovecot.org/LDA/Qmail I use '/var/qmail/bin/preline -f /usr/lib/dovecot/dovecot-lda -f
"${SENDER}" -d ${LOCAL%+*}@${HOST} ${EXT:+ -m INBOX/$EXT}' do let qmail support the '+' as recipient delimiter.

And here last variable must expand to "INBOX/$EXT".

That's all. Andreas