Hi Sebastian,
I tried to recreate your case but it seems to work for me right away.

ip addr show dev eth0
[...]
    inet 10.0.4.191/24 brd 10.0.4.255 scope global dynamic eth0
    inet6 2001:1::1/64 scope global

# tail -n 2 /etc/hosts
10.0.4.191 mysys
2001:1::1 mysys

# grep '^listen' /etc/dovecot/dovecot.conf
listen = mysys

# ping -4 mysys -c 1
PING mysys (10.0.4.191) 56(84) bytes of data.
64 bytes from mysys (10.0.4.191): icmp_seq=1 ttl=64 time=0.042 ms

# ping -6 mysys -c 1
PING mysys(mysys (2001:1::1)) 56 data bytes
64 bytes from mysys (2001:1::1): icmp_seq=1 ttl=64 time=0.036 ms


# systemctl restart dovecot
root@artful-test:~# systemctl status dovecot
● dovecot.service - Dovecot IMAP/POP3 email server
   Loaded: loaded (/lib/systemd/system/dovecot.service; enabled; vendor preset: 
enabled)
   Active: active (running) since Fri 2017-11-10 09:52:30 UTC; 2s ago
     Docs: man:dovecot(1)
           http://wiki2.dovecot.org/
  Process: 543 ExecStart=/usr/sbin/dovecot (code=exited, status=0/SUCCESS)
 Main PID: 545 (dovecot)
    Tasks: 4 (limit: 4915)
   Memory: 5.0M
      CPU: 37ms
   CGroup: /system.slice/dovecot.service
           ├─545 /usr/sbin/dovecot
           ├─546 dovecot/anvil
           ├─547 dovecot/log
           └─549 dovecot/config

Nov 10 09:52:30 artful-test systemd[1]: Starting Dovecot IMAP/POP3 email 
server...
Nov 10 09:52:30 artful-test dovecot[545]: master: Dovecot v2.2.27 (c0f36b0) 
starting up for imap, pop3, sieve (core dumps disabled)
Nov 10 09:52:30 artful-test systemd[1]: Started Dovecot IMAP/POP3 email server.

# netstat -eeapn | grep :143
tcp        0      0 10.0.4.191:143          0.0.0.0:*               LISTEN      
0          112176111  545/dovecot         
tcp6       0      0 2001:1::1:143           :::*                    LISTEN      
0          112176110  545/dovecot

If you could provide more details how to recreate the issue you are
seeing that would be great.

** Changed in: dovecot (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1730966

Title:
  Dovecot cannot bind to address on boot

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