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Ran Talbott

2010-Dec-26 03:49 UTC

[Dovecot] Dovecot 1.2.12 + Postfix + virtual domains: delivering to system users

As mentioned in my previous posting, I've set up a mailserver for a domain
of
Winboxen,  authenticated through Active Directory.  After some struggles,  I 
finally got that working.  But I also need to receive emails for a few system 
users on the mailserver (like postmaster,  and a couple of accounts set up 
for maintaining the system).

I thought,  based on the way I read the documentation,  that I could just add 
a "userdb passwd",  ahead of the "userdb ldap",  and deliver
would find their
home directory maildirs.  The virtual users would fail the passwd search,  
fall through to the LDAP check,  and deliver would drop their mail into their 
maildirs in the /var/mailstore tree.  I knew the system users wouldn't be 
able to login to the IMAP server,  but this isn't a concern.

Instead,  the system users' mail got bounced,  after an auth check via 
the "master" socket (from Postfix, I guess: it's a transient
process) whose
details don't get logged.  And the virtual users' lookups (done by
deliver)
returned made-up UIDs and GIDs,  and maildir locations 
(/home/<realm>/<username>) completely different from what the LDAP
lookup
normally returns (/var/mailstore/<username>).

So what am I missing here?  I managed to work around this by adding the system 
users to the Postfix virtual.db,  but it would be nice to not need to do 
that.  It would also be nice to neable the system users to check email by 
logging in to the IMAP serve,  but I'm reluctant to even try that after the 
way delivery went completely wonky.

Thanks,

Ran

Timo Sirainen

2010-Dec-30 10:52 UTC

head link

[Dovecot] Dovecot 1.2.12 + Postfix + virtual domains: delivering to system users

On Sat, 2010-12-25 at 20:49 -0700, Ran Talbott wrote:> As mentioned in my previous posting, I've set up a mailserver for a
domain of
> Winboxen,  authenticated through Active Directory.  After some struggles, 
I
> finally got that working.  But I also need to receive emails for a few
system
> users on the mailserver (like postmaster,  and a couple of accounts set up 
> for maintaining the system).
> 
> I thought,  based on the way I read the documentation,  that I could just
add
> a "userdb passwd",  ahead of the "userdb ldap",  and
deliver would find their
> home directory maildirs.  The virtual users would fail the passwd search,  
> fall through to the LDAP check,  and deliver would drop their mail into
their
> maildirs in the /var/mailstore tree.  I knew the system users wouldn't
be
> able to login to the IMAP server,  but this isn't a concern.
Yes, sounds right.
> Instead,  the system users' mail got bounced,  after an auth check via 
> the "master" socket (from Postfix, I guess: it's a transient
process) whose
> details don't get logged.  And the virtual users' lookups (done by
deliver)
> returned made-up UIDs and GIDs,  and maildir locations 
> (/home/<realm>/<username>) completely different from what the
LDAP lookup
> normally returns (/var/mailstore/<username>).
I've no idea why that would happen. dovecot -n output and logs with
auth_debug=yes + mail_debug=yes would be helpful.

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Ran Talbott

2010-Dec-31 09:18 UTC

head link

[Dovecot] Dovecot 1.2.12 + Postfix + virtual domains: delivering to system users

I've tested with 3 different configurations,  using 3 users:

  ran - a Linux system user that's in the postfix "virtual.db"
  vmail - a system user _not_ in virtual.db
  testing.testing - a Windoze user with no Linux account

All 3 configurations have passdb ldap and userdb ldap.

First config has no userdb or passdb for the Linux users.  Second config adds 
userdb passwd.  Both work the same:
   Mail to vmail bounces
   Mail to ran is delivered OK to /home/ran/maildir
   Mail to testing.testing goes to /var/mailstore//testing.testing/Maildir

But testing.testing mail _should_ go 
to /var/mailstore/<domain>/testing.testing/Maildir.  As mentioned in my 
earlier email,  %d doesn't seem to work with LDAP queries.

The third config adds passdb shadow.
   Mail to vmail bounces
   Mail to ran is delivered OK to /home/ran/maildir
   Mail to testing.testing tries to go to /home/testing.testing/Maildir. This
     delivery attempt fails because the manufactured Linux uid and gid are
     wrong.  But it's also the wrong directory.

In a nutshel:  it appears Dovecot can't deliver to sysem users at all
(Postfix
is taking care of "ran"), and the mere presence of a "passdb
shadow" causes
the DAP lookups to go awry.

Here's the dovecot -n and mail.log for configuration 1 (email addresses in
all
logs have been obscured by replacing domain name):

# 1.2.12: dovecot.conf.9
# OS: Linux 2.6.35-23-generic-pae i686 Ubuntu 10.10 ext4
log_timestamp: %Y-%m-%d %H:%M:%S 
login_dir: /var/run/dovecot/login
login_executable: /usr/lib/dovecot/imap-login
mail_privileged_group: mail
mail_uid: 501
mail_gid: 501
mail_location: maildir:/var/mailstore/%d/%n/Maildir
mbox_write_locks: fcntl dotlock
imap_client_workarounds: delay-newmail outlook-idle netscape-eoh
lda:
  postmaster_address: mail.server at lawleytechsupport.info
  hostname: lawleytechsupport.info
auth default:
  mechanisms: plain login
  username_format: %Ln
  verbose: yes
  debug: yes
  passdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  userdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      mode: 432
      user: postfix
      group: postfix
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
      user: vmail


Dec 30 19:25:30 IBMUBUNTU1 dovecot: last message repeated 2 times
Dec 30 19:25:30 IBMUBUNTU1 dovecot: auth(default): Killed with signal 15 (by 
pid=1 uid=0 code=kill)
Dec 30 19:25:30 IBMUBUNTU1 dovecot: dovecot: Killed with signal 15 (by pid=1 
uid=0 code=kill)
Dec 30 19:25:30 IBMUBUNTU1 dovecot: Dovecot v1.2.12 starting up (core dumps 
disabled)
Dec 30 19:25:36 IBMUBUNTU1 dovecot: auth(default): new auth connection: 
pid=24878
Dec 30 19:25:36 IBMUBUNTU1 dovecot: auth(default): new auth connection: 
pid=24877
Dec 30 19:25:36 IBMUBUNTU1 dovecot: auth(default): new auth connection: 
pid=24879
Dec 30 19:26:57 IBMUBUNTU1 postfix/smtpd[24884]: connect from 
fed1rmmtao105.cox.net[68.230.241.41]
Dec 30 19:26:57 IBMUBUNTU1 dovecot: auth(default): new auth connection: 
pid=24884
Dec 30 19:26:57 IBMUBUNTU1 postfix/smtpd[24884]: NOQUEUE: reject: RCPT from 
fed1rmmtao105.cox.net[68.230.241.41]: 550 5.1.1 <vmail at yyy.yyy>:
Recipient
address rejected: User unknown in virtual mailbox table; 
from=<embed-mobile at xxx.xxx> to=<vmail at yyy.yyy> proto=ESMTP 
helo=<fed1rmmtao105.cox.net>
Dec 30 19:26:57 IBMUBUNTU1 postfix/smtpd[24884]: disconnect from 
fed1rmmtao105.cox.net[68.230.241.41]
Dec 30 19:27:11 IBMUBUNTU1 postfix/smtpd[24884]: connect from 
fed1rmmtao105.cox.net[68.230.241.41]
Dec 30 19:27:11 IBMUBUNTU1 postfix/smtpd[24884]: 3E63A101F19: 
client=fed1rmmtao105.cox.net[68.230.241.41]
Dec 30 19:27:11 IBMUBUNTU1 postfix/cleanup[24889]: 3E63A101F19: 
message-id=<201012301925.44033.embed-mobile at xxx.xxx>
Dec 30 19:27:11 IBMUBUNTU1 postfix/qmgr[19282]: 3E63A101F19: 
from=<embed-mobile at xxx.xxx>, size=1361, nrcpt=1 (queue active)
Dec 30 19:27:11 IBMUBUNTU1 postfix/smtpd[24884]: disconnect from 
fed1rmmtao105.cox.net[68.230.241.41]
Dec 30 19:27:11 IBMUBUNTU1 postfix/local[24890]: 3E63A101F19: 
to=<ran at localhost>, orig_to=<ran at yyy.yyy>, relay=local,
delay=0.28,
delays=0.23/0.01/0/0.04, dsn=2.0.0, status=sent (delivered to maildir)
Dec 30 19:27:11 IBMUBUNTU1 postfix/qmgr[19282]: 3E63A101F19: removed
Dec 30 19:27:25 IBMUBUNTU1 postfix/smtpd[24884]: connect from 
fed1rmmtao103.cox.net[68.230.241.43]
Dec 30 19:27:25 IBMUBUNTU1 postfix/smtpd[24884]: 1DA90101F19: 
client=fed1rmmtao103.cox.net[68.230.241.43]
Dec 30 19:27:25 IBMUBUNTU1 postfix/cleanup[24889]: 1DA90101F19: 
message-id=<201012301925.57821.embed-mobile at xxx.xxx>
Dec 30 19:27:25 IBMUBUNTU1 postfix/qmgr[19282]: 1DA90101F19: 
from=<embed-mobile at xxx.xxx>, size=1409, nrcpt=1 (queue active)
Dec 30 19:27:25 IBMUBUNTU1 dovecot: auth(default): master in: 
USER#0111#011testing.testing at yyy.yyy#011service=deliver
Dec 30 19:27:25 IBMUBUNTU1 dovecot: auth(default): ldap(testing.testing): user 
search: base=dc=lawley, dc=local scope=subtree filter=(&(objectClass=user)
(samaccountname=testing.testing)) fieldsDec 30 19:27:25 IBMUBUNTU1 dovecot:
auth(default): ldap(testing.testing):
result: objectClass(?unknown?)= cn(?unknown?)= sn(?unknown?)= 
givenName(?unknown?)= distinguishedName(?unknown?)= instanceType(?unknown?)= 
whenCreated(?unknown?)= whenChanged(?unknown?)= displayName(?unknown?)= 
uSNCreated(?unknown?)= uSNChanged(?unknown?)= name(?unknown?)= 
objectGUID(?unknown?)= userAccountControl(?unknown?)= 
primaryGroupID(?unknown?)= objectSid(?unknown?)= sAMAccountName(?unknown?)= 
sAMAccountType(?unknown?)= userPrincipalName(?unknown?)= 
objectCategory(?unknown?)Dec 30 19:27:25 IBMUBUNTU1 dovecot: auth(default):
master out:
USER#0111#011testing.testing#011home=/var/mailstore//testing.testing. 
=uid=501#011gid=501#011mail=maildir:/var/mailstore//testing.testing/Maildir/
Dec 30 19:27:25 IBMUBUNTU1 postfix/smtpd[24884]: disconnect from 
fed1rmmtao103.cox.net[68.230.241.43]
Dec 30 19:27:25 IBMUBUNTU1 dovecot: deliver(testing.testing): 
msgid=<201012301925.57821.embed-mobile at xxx.xxx>: saved mail to INBOX
Dec 30 19:27:25 IBMUBUNTU1 postfix/pipe[24891]: 1DA90101F19: 
to=<testing.testing at yyy.yyy>, relay=dovecot, delay=0.36, 
delays=0.23/0.01/0/0.12, dsn=2.0.0, status=sent (delivered via dovecot 
service)
Dec 30 19:27:25 IBMUBUNTU1 postfix/qmgr[19282]: 1DA90101F19: removed


**********************************************************************
Here's the dovecot -n and mail.log for configuration 2:
# 1.2.12: dovecot.conf.11
# OS: Linux 2.6.35-23-generic-pae i686 Ubuntu 10.10 ext4
log_timestamp: %Y-%m-%d %H:%M:%S 
login_dir: /var/run/dovecot/login
login_executable: /usr/lib/dovecot/imap-login
mail_privileged_group: mail
mail_uid: 501
mail_gid: 501
mail_location: maildir:/var/mailstore/%d/%n/Maildir
mbox_write_locks: fcntl dotlock
imap_client_workarounds: delay-newmail outlook-idle netscape-eoh
lda:
  postmaster_address: mail.server at lawleytechsupport.info
  hostname: lawleytechsupport.info
auth default:
  mechanisms: plain login
  username_format: %Ln
  verbose: yes
  debug: yes
  passdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  userdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  userdb:
    driver: passwd
    args: mail=maildir:~/Maildir
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      mode: 432
      user: postfix
      group: postfix
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
      user: vmail

Dec 30 19:18:39 IBMUBUNTU1 postfix/smtpd[24843]: connect from 
fed1rmmtao102.cox.net[68.230.241.44]
Dec 30 19:18:39 IBMUBUNTU1 dovecot: auth(default): new auth connection: 
pid=24843
Dec 30 19:18:39 IBMUBUNTU1 postfix/smtpd[24843]: NOQUEUE: reject: RCPT from 
fed1rmmtao102.cox.net[68.230.241.44]: 550 5.1.1 <vmail at yyy.yyy>:
Recipient
address rejected: User unknown in virtual mailbox table; 
from=<embed-mobile at xxx.xxx> to=<vmail at yyy.yyy> proto=ESMTP 
helo=<fed1rmmtao102.cox.net>
Dec 30 19:18:39 IBMUBUNTU1 postfix/smtpd[24843]: disconnect from 
fed1rmmtao102.cox.net[68.230.241.44]
Dec 30 19:18:54 IBMUBUNTU1 postfix/smtpd[24843]: connect from 
fed1rmmtao107.cox.net[68.230.241.39]
Dec 30 19:18:54 IBMUBUNTU1 postfix/smtpd[24843]: 636DD101F22: 
client=fed1rmmtao107.cox.net[68.230.241.39]
Dec 30 19:18:54 IBMUBUNTU1 postfix/cleanup[24848]: 636DD101F22: 
message-id=<201012301917.17808.embed-mobile at xxx.xxx>
Dec 30 19:18:54 IBMUBUNTU1 postfix/qmgr[19282]: 636DD101F22: 
from=<embed-mobile at xxx.xxx>, size=1362, nrcpt=1 (queue active)
Dec 30 19:18:54 IBMUBUNTU1 postfix/smtpd[24843]: disconnect from 
fed1rmmtao107.cox.net[68.230.241.39]
Dec 30 19:18:54 IBMUBUNTU1 postfix/local[24849]: 636DD101F22: 
to=<ran at localhost>, orig_to=<ran at yyy.yyy>, relay=local,
delay=0.31,
delays=0.26/0.01/0/0.04, dsn=2.0.0, status=sent (delivered to maildir)
Dec 30 19:18:54 IBMUBUNTU1 postfix/qmgr[19282]: 636DD101F22: removed
Dec 30 19:19:02 IBMUBUNTU1 postfix/smtpd[24843]: connect from 
fed1rmmtao106.cox.net[68.230.241.40]
Dec 30 19:19:03 IBMUBUNTU1 postfix/smtpd[24843]: 047FA101F22: 
client=fed1rmmtao106.cox.net[68.230.241.40]
Dec 30 19:19:03 IBMUBUNTU1 postfix/cleanup[24848]: 047FA101F22: 
message-id=<201012301917.31815.embed-mobile at xxx.xxx>
Dec 30 19:19:03 IBMUBUNTU1 postfix/qmgr[19282]: 047FA101F22: 
from=<embed-mobile at xxx.xxx>, size=1408, nrcpt=1 (queue active)
Dec 30 19:19:03 IBMUBUNTU1 dovecot: auth(default): master in: 
USER#0111#011testing.testing at yyy.yyy#011service=deliver
Dec 30 19:19:03 IBMUBUNTU1 dovecot: auth(default): ldap(testing.testing): user 
search: base=dc=lawley, dc=local scope=subtree filter=(&(objectClass=user)
(samaccountname=testing.testing)) fieldsDec 30 19:19:03 IBMUBUNTU1 dovecot:
auth(default): ldap(testing.testing):
result: objectClass(?unknown?)= cn(?unknown?)= sn(?unknown?)= 
givenName(?unknown?)= distinguishedName(?unknown?)= instanceType(?unknown?)= 
whenCreated(?unknown?)= whenChanged(?unknown?)= displayName(?unknown?)= 
uSNCreated(?unknown?)= uSNChanged(?unknown?)= name(?unknown?)= 
objectGUID(?unknown?)= userAccountControl(?unknown?)= 
primaryGroupID(?unknown?)= objectSid(?unknown?)= sAMAccountName(?unknown?)= 
sAMAccountType(?unknown?)= userPrincipalName(?unknown?)= 
objectCategory(?unknown?)Dec 30 19:19:03 IBMUBUNTU1 dovecot: auth(default):
master out:
USER#0111#011testing.testing#011home=/var/mailstore//testing.testing. 
=uid=501#011gid=501#011mail=maildir:/var/mailstore//testing.testing/Maildir/
Dec 30 19:19:03 IBMUBUNTU1 postfix/smtpd[24843]: disconnect from 
fed1rmmtao106.cox.net[68.230.241.40]
Dec 30 19:19:03 IBMUBUNTU1 dovecot: deliver(testing.testing): 
msgid=<201012301917.31815.embed-mobile at xxx.xxx>: saved mail to INBOX
Dec 30 19:19:03 IBMUBUNTU1 postfix/pipe[24850]: 047FA101F22: 
to=<testing.testing at yyy.yyy>, relay=dovecot, delay=0.56, 
delays=0.46/0.01/0/0.1, dsn=2.0.0, status=sent (delivered via dovecot 
service)
Dec 30 19:19:03 IBMUBUNTU1 postfix/qmgr[19282]: 047FA101F22: removed




**********************************************************************
Here's the dovecot -n and mail.log for configuration 3:

# 1.2.12: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.35-23-generic-pae i686 Ubuntu 10.10 ext4
log_timestamp: %Y-%m-%d %H:%M:%S 
login_dir: /var/run/dovecot/login
login_executable: /usr/lib/dovecot/imap-login
mail_privileged_group: mail
mail_uid: 501
mail_gid: 501
mail_location: maildir:/var/mailstore/%d/%n/Maildir
mbox_write_locks: fcntl dotlock
imap_client_workarounds: delay-newmail outlook-idle netscape-eoh
lda:
  postmaster_address: mail.server at lawleytechsupport.info
  hostname: lawleytechsupport.info
auth default:
  mechanisms: plain login
  username_format: %Ln
  verbose: yes
  debug: yes
  passdb:
    driver: shadow
  passdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  userdb:
    driver: passwd
    args: mail=maildir:/home/%n/Maildir
  userdb:
    driver: ldap
    args: /etc/dovecot/dovecot-ldap.conf
  socket:
    type: listen
    client:
      path: /var/spool/postfix/private/auth
      mode: 432
      user: postfix
      group: postfix
    master:
      path: /var/run/dovecot/auth-master
      mode: 384
      user: vmail

Dec 30 08:02:20 IBMUBUNTU1 postfix/cleanup[23693]: 502151009C7: 
message-id=<20101230150220.502151009C7 at mail.lawleytechsupport.info>
Dec 30 08:02:20 IBMUBUNTU1 postfix/qmgr[19282]: 502151009C7: 
from=<root at yyy.yyy>, size=409, nrcpt=1 (queue active)
Dec 30 08:02:20 IBMUBUNTU1 postfix/local[23695]: 502151009C7: 
to=<root at localhost>, orig_to=<root>, relay=local, delay=0.19, 
delays=0.14/0.02/0/0.03, dsn=2.0.0, status=sent (delivered to maildir)
Dec 30 08:02:20 IBMUBUNTU1 postfix/qmgr[19282]: 502151009C7: removed
Dec 30 17:34:41 IBMUBUNTU1 postfix/smtpd[24338]: connect from 
fed1rmmtao107.cox.net[68.230.241.39]
Dec 30 17:34:41 IBMUBUNTU1 dovecot: auth(default): new auth connection: 
pid=24338
Dec 30 17:34:41 IBMUBUNTU1 postfix/smtpd[24338]: NOQUEUE: reject: RCPT from 
fed1rmmtao107.cox.net[68.230.241.39]: 550 5.1.1 <vmail at yyy.yyy>:
Recipient
address rejected: User unknown in virtual mailbox table; 
from=<embed-mobile at xxx.xxx> to=<vmail at yyy.yyy> proto=ESMTP 
helo=<fed1rmmtao107.cox.net>
Dec 30 17:34:42 IBMUBUNTU1 postfix/smtpd[24338]: disconnect from 
fed1rmmtao107.cox.net[68.230.241.39]
Dec 30 17:37:34 IBMUBUNTU1 postfix/smtpd[24346]: connect from 
fed1rmmtao103.cox.net[68.230.241.43]
Dec 30 17:37:34 IBMUBUNTU1 dovecot: auth(default): new auth connection: 
pid=24346
Dec 30 17:37:34 IBMUBUNTU1 postfix/smtpd[24346]: 60C91101F15: 
client=fed1rmmtao103.cox.net[68.230.241.43]
Dec 30 17:37:34 IBMUBUNTU1 postfix/cleanup[24350]: 60C91101F15: 
message-id=<201012301736.07378.embed-mobile at xxx.xxx>
Dec 30 17:37:34 IBMUBUNTU1 postfix/qmgr[19282]: 60C91101F15: 
from=<embed-mobile at xxx.xxx>, size=1378, nrcpt=1 (queue active)
Dec 30 17:37:34 IBMUBUNTU1 postfix/local[24351]: 60C91101F15: 
to=<ran at localhost>, orig_to=<ran at yyy.yyy>, relay=local,
delay=0.3,
delays=0.24/0.01/0/0.05, dsn=2.0.0, status=sent (delivered to maildir)
Dec 30 17:37:34 IBMUBUNTU1 postfix/qmgr[19282]: 60C91101F15: removed
Dec 30 17:37:34 IBMUBUNTU1 postfix/smtpd[24346]: disconnect from 
fed1rmmtao103.cox.net[68.230.241.43]
Dec 30 17:40:54 IBMUBUNTU1 postfix/anvil[24341]: statistics: max connection 
rate 1/60s for (smtp:68.230.241.39) at Dec 30 17:34:41
Dec 30 17:40:54 IBMUBUNTU1 postfix/anvil[24341]: statistics: max connection 
count 1 for (smtp:68.230.241.39) at Dec 30 17:34:41
Dec 30 17:40:54 IBMUBUNTU1 postfix/anvil[24341]: statistics: max cache size 1 
at Dec 30 17:34:41
Dec 30 17:55:05 IBMUBUNTU1 postfix/smtpd[24508]: connect from 
fed1rmmtao107.cox.net[68.230.241.39]
Dec 30 17:55:05 IBMUBUNTU1 dovecot: auth(default): new auth connection: 
pid=24508
Dec 30 17:55:06 IBMUBUNTU1 postfix/smtpd[24508]: 230F2101F19: 
client=fed1rmmtao107.cox.net[68.230.241.39]
Dec 30 17:55:06 IBMUBUNTU1 postfix/cleanup[24513]: 230F2101F19: 
message-id=<201012301753.38728.embed-mobile at xxx.xxx>
Dec 30 17:55:06 IBMUBUNTU1 postfix/qmgr[19282]: 230F2101F19: 
from=<embed-mobile at xxx.xxx>, size=1425, nrcpt=1 (queue active)
Dec 30 17:55:06 IBMUBUNTU1 dovecot: auth(default): master in: 
USER#0111#011testing.testing at yyy.yyy#011service=deliver
Dec 30 17:55:06 IBMUBUNTU1 dovecot: auth(default): passwd(testing.testing): 
lookup
Dec 30 17:55:06 IBMUBUNTU1 postfix/smtpd[24508]: disconnect from 
fed1rmmtao107.cox.net[68.230.241.39]
Dec 30 17:55:16 IBMUBUNTU1 dovecot: auth(default): master out: 
USER#0111#011testing.testing#011mail=maildir:/home/testing.testing/Maildir#011system_groups_user=testing.testing#011uid=10001#011gid=10013#011home=/home/LAWLEY/testing.testing
Dec 30 17:55:16 IBMUBUNTU1 dovecot: deliver(testing.testing at yyy.yyy): Fatal: 
setgid(10013(domain users)) failed with euid=501(vmail), gid=501(vmail), 
egid=501(vmail): Operation not permitted (This binary should probably be 
called with process group set to 10013(domain users) instead of 501(vmail))
Dec 30 17:55:16 IBMUBUNTU1 postfix/pipe[24514]: 230F2101F19: 
to=<testing.testing at yyy.yyy>, relay=dovecot, delay=11,
delays=0.34/0.01/0/10,
dsn=4.3.0, status=deferred (temporary failure)

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