I had the problem with the part:
apparmor="ALLOWED" operation="connect" info="Failed name lookup - disconnected 
path" error=-13 profile="/usr/lib/dovecot/dovecot-lda" 
name="run/dovecot/auth-userdb" pid=15664 comm="dovecot-lda" requested_mask="wr" 
denied_mask="wr" fsuid=0 ouid=134

After modifying rsp. udating the file /etc/apparmor.d/tunables/devecot
with the place where I'm storing the mails it was working

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https://bugs.launchpad.net/bugs/1650827

Title:
  "Failed name lookup - disconnected path"

Status in apparmor package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  I'm currently trying to use dovecot in a test scenario, but run into
  the problem of a strange malfunction of apparmor.

  What I do:

  installed packages   dovecot-core   and   dovecot-lmtp
  (and of course apparmor)

  Then I do (as root)

  /usr/lib/dovecot/dovecot-lda -d hadmut <<ENDE
  Subject: test

  blabla
  ENDE

  
  which fails. strace shows:

  
  14353 connect(6, {sa_family=AF_LOCAL, sun_path="/var/run/dovecot/config"}, 
110) = -1 EACCES (Permission denied)

  ...

  14353 connect(7, {sa_family=AF_LOCAL, sun_path="/var/run/dovecot/auth-
  userdb"}, 110) = -1 EACCES (Permission denied)

  
  although file permissions are good, unix sockets exist and daemons are 
listening. 

  /var/log/kern.log says

  
  Dec 18 01:09:45 monstrum kernel: [34849.052767] audit: type=1400 
audit(1482019785.088:143): apparmor="ALLOWED" operation="connect" info="Failed 
name lookup - disconnected path" error=-13 
profile="/usr/lib/dovecot/dovecot-lda" name="run/dovecot/config" pid=15664 
comm="dovecot-lda" requested_mask="wr" denied_mask="wr" fsuid=0 ouid=0
  Dec 18 01:09:45 monstrum kernel: [34849.055652] audit: type=1400 
audit(1482019785.092:144): apparmor="ALLOWED" operation="open" 
profile="/usr/lib/dovecot/dovecot-lda" name="/usr/share/dovecot/protocols.d/" 
pid=15664 comm="doveconf" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
  Dec 18 01:09:45 monstrum kernel: [34849.065203] audit: type=1400 
audit(1482019785.100:145): apparmor="ALLOWED" operation="connect" info="Failed 
name lookup - disconnected path" error=-13 
profile="/usr/lib/dovecot/dovecot-lda" name="run/dovecot/auth-userdb" pid=15664 
comm="dovecot-lda" requested_mask="wr" denied_mask="wr" fsuid=0 ouid=134


  which strangely says ALLOWED, but error=-13 as well,

  and that even if dovecot-lda is in complain mode.

  
  But when I put it into disable mode with 

  aa-disable /usr/lib/dovecot/dovecot-lda

  
  then things work.


  
  So 

  - it is definitely apparmor related, since aa-disable turns the problem off, 
  - it looks like a bug since aa-complain should never block anything,
  - an ALLOWED-log should not blog
  - there's an error=-13

  regards

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: apparmor-profiles 2.10.95-0ubuntu2.5
  ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30
  Uname: Linux 4.4.0-53-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.2
  Architecture: amd64
  CurrentDesktop: LXDE
  Date: Sun Dec 18 01:06:15 2016
  PackageArchitecture: all
  ProcKernelCmdline: BOOT_IMAGE=/vmlinuz-4.4.0-53-generic 
root=UUID=3e286927-f1b6-4954-8b0d-7cf23484309f ro rootflags=subvol=@ splash 
quiet vt.handoff=7
  SourcePackage: apparmor
  UpgradeStatus: Upgraded to xenial on 2016-04-06 (255 days ago)

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