More investigation shows the following:

1) posfix + dovecot: works like a charm, extract from mail log:

Sep 11 10:08:02 nwinnie postfix/pickup[12904]: 0F2B4C03D: uid=1001
from=<stava>
Sep 11 10:08:02 nwinnie postfix/cleanup[20596]: 0F2B4C03D:
message-id=<[EMAIL PROTECTED]>
Sep 11 10:08:02 nwinnie postfix/qmgr[12905]: 0F2B4C03D:
from=<[EMAIL PROTECTED]>, size=436, nrcpt=1 (queue active)
Sep 11 10:08:02 nwinnie postfix/local[20598]: warning: dict_nis_init:
NIS domain name not set - NIS lookups disabled
Sep 11 10:08:02 nwinnie deliver(stava): Loading modules from directory:
/usr/lib/dovecot/modules/lda
Sep 11 10:08:02 nwinnie deliver(stava): Module loaded:
/usr/lib/dovecot/modules/lda/lib10_quota_plugin.so
Sep 11 10:08:02 nwinnie deliver(stava): Module loaded:
/usr/lib/dovecot/modules/lda/lib90_cmusieve_plugin.so
Sep 11 10:08:02 nwinnie deliver(stava): maildir: data=/home/stava/Mail
Sep 11 10:08:02 nwinnie deliver(stava): maildir: root=/home/stava/Mail,
index=/home/stava/Mail, control=, inbox=
Sep 11 10:08:02 nwinnie deliver(stava): fs quota add storage dir =
/home/stava/Mail
Sep 11 10:08:02 nwinnie deliver(stava): fs quota block device =
/dev/mapper/sys-home
Sep 11 10:08:02 nwinnie deliver(stava): fs quota mount point = /home
Sep 11 10:08:02 nwinnie deliver(stava):
msgid=<[EMAIL PROTECTED]>: saved mail to INBOX
Sep 11 10:08:02 nwinnie postfix/local[20598]: 0F2B4C03D:
to=<[EMAIL PROTECTED]>, orig_to=<stava>, relay=local,
delay=0.94, delays=0.2/0.01/0/0.73, dsn=2.0.0, status=sent (delivered to
command: /usr/lib/dovecot/deliver)
Sep 11 10:08:02 nwinnie postfix/qmgr[12905]: 0F2B4C03D: removed

2) postfix + dspam + dovecot: fails, extract from mail log:

Sep 11 10:10:48 nwinnie postfix/pickup[27124]: 612AEC03D: uid=1001
from=<stava>
Sep 11 10:10:48 nwinnie postfix/cleanup[27441]: 612AEC03D:
message-id=<[EMAIL PROTECTED]>
Sep 11 10:10:48 nwinnie postfix/qmgr[27126]: 612AEC03D:
from=<[EMAIL PROTECTED]>, size=436, nrcpt=1 (queue active)
Sep 11 10:10:48 nwinnie deliver([EMAIL PROTECTED]): Loading
modules from directory: /usr/lib/dovecot/modules/lda
Sep 11 10:10:48 nwinnie deliver([EMAIL PROTECTED]): Module
loaded: /usr/lib/dovecot/modules/lda/lib10_quota_plugin.so
Sep 11 10:10:48 nwinnie deliver([EMAIL PROTECTED]): Module
loaded: /usr/lib/dovecot/modules/lda/lib90_cmusieve_plugin.so
Sep 11 10:10:48 nwinnie dovecot: auth(default): master in: USER 1
[EMAIL PROTECTED]       service=deliver
Sep 11 10:10:48 nwinnie dovecot: auth-worker(default):
passwd([EMAIL PROTECTED]): lookup
Sep 11 10:10:48 nwinnie dovecot: auth-worker(default):
passwd([EMAIL PROTECTED]): unknown user
Sep 11 10:10:48 nwinnie dovecot: auth(default): master out: NOTFOUND    1
Sep 11 10:10:48 nwinnie dspam[27127]: Delivery agent returned exit code
67: /usr/lib/dovecot/deliver -d [EMAIL PROTECTED]
Sep 11 10:10:48 nwinnie postfix/lmtp[27444]: 612AEC03D:
to=<[EMAIL PROTECTED]>, orig_to=<stava>,
relay=nwinnie.telcotec.se[/var/tmp/dspam.sock], delay=0.2,
delays=0.17/0.01/0.01/0.01, dsn=4.3.0, status=deferred (host
nwinnie.telcotec.se[/var/tmp/dspam.sock] said: 421 4.3.0
<[EMAIL PROTECTED]> Delivered (in reply to end of DATA command))

One big difference is that in case 1) the user being looked up
is "stava", whereas in case 2) it's "[EMAIL PROTECTED]", which fails.

"auth_username_format = %n" is set in dovecot.conf, but to no avail.

dovecot -n:
# 1.0.5: /etc/dovecot/dovecot.conf
base_dir: /var/run/dovecot/
protocols: imap imaps pop3 pop3s
ssl_disable: yes
disable_plaintext_auth: no
login_dir: /var/run/dovecot//login
login_executable(default): /usr/lib/dovecot/imap-login
login_executable(imap): /usr/lib/dovecot/imap-login
login_executable(pop3): /usr/lib/dovecot/pop3-login
mail_extra_groups: mail
mail_location: maildir:~/Mail
mail_debug: yes
mail_full_filesystem_access: yes
dotlock_use_excl: yes
maildir_copy_with_hardlinks: yes
mail_executable(default): /usr/lib/dovecot/imap
mail_executable(imap): /usr/lib/dovecot/imap
mail_executable(pop3): /usr/lib/dovecot/pop3
mail_plugins: quota trash
mail_plugin_dir(default): /usr/lib/dovecot/modules/imap
mail_plugin_dir(imap): /usr/lib/dovecot/modules/imap
mail_plugin_dir(pop3): /usr/lib/dovecot/modules/pop3
imap_client_workarounds(default): delay-newmail outlook-idle
imap_client_workarounds(imap): delay-newmail outlook-idle
imap_client_workarounds(pop3): outlook-idle
pop3_uidl_format(default):
pop3_uidl_format(imap):
pop3_uidl_format(pop3): %v.%u
pop3_client_workarounds(default):
pop3_client_workarounds(imap):
pop3_client_workarounds(pop3): outlook-no-nuls oe-ns-eoh
auth default:
  mechanisms: plain login gssapi
  username_format: %n
  verbose: yes
  debug: yes
  debug_passwords: yes
  passdb:
    driver: pam
    args: blocking=yes dovecot
  userdb:
    driver: passwd
    args: blocking=yes
  socket:
    type: listen
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
plugin:
  quota: fs:storage=102400:messages=0
  trash: /etc/dovecot/trash.conf
  sieve: .dovecot.sieve

Any ideas appreciated

Cheers
/Lars

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