I tried to use dovcots lmtp instead of dovecot-lda.
postfix has in master.cf ... dovecot-lda -f ... -d ${user} to separate the user part from user@hostname.domain.
So lookup of "user" succeeds in userdb (LDAP) done by dovecot-lda.

I have always local addresses like to=<user@hostname.domain>
postfix/lmtp[6579]: [ID 197553 mail.info] B3CDA66A16: to=<h0094...@mailstore4.hu-berlin.de>

With lmtp the userpart must be separated also. I tried user_filter (LDAP) with %n, %Ln, %8n without success: userdb lookup: user@hostname.domain doesn't exist)

dovecot-2.1.17
I used "doveadm user h0094slk" and
"doveadm user h0094...@mailstore4.hu-berlin.de"
for my tests.

userdb {
  driver = ldap
  args = /usr/dovecot/etc/ldapuser.conf
}
and ldapuser.conf with
...
user_filter = (&(uid=%n) (objectClass=cmsAccount))
user_attrs = homeDirectory=home

I modified user_filter like uid=%Ln or uid=%8u

success for doveadm user h0094slk (because nothing to split)
userdb: h0094slk
  home      : /home/p0094/h0094slk

but no success for
doveadm user h0094...@mailstore4.hu-berlin.de
userdb lookup: user h0094...@mailstore4.hu-berlin.de doesn't exist

It looks for me like user_filter do not use variables at this point?
What I'm missing?

--
Mit freundlichen Grüßen --- Burckhard Schmidt

Abteilung Systemsoftware und Kommunikation
ZE Computer- und Medienservice der Humboldt-Universität zu Berlin
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Standort:      Rudower Chaussee 26; 12489 Berlin
Tel.:          +49-30-2093-70058  Fax: +49-30-2093-2959
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