circular mail will be send dublicated

Coffee_is_life

Hello Forum,

after upgrade to 8.4.2.0-10 i got an error when sending circular mails via distribution groups:

szenario:
Sending a Mail at “Verteiler 1”; “Verteiler 2”;[…] - Verteiler gets resolved in the specified users - ok
postfix sets them into queue for delivering and gets following error:

Nov  9 14:04:11 pwmail002 postfix/lmtp[16792]: 06BB322C8C: to=<user1@domain.de>, relay=localhost[127.0.0.1]:2003, delay=681, delays=657/0.63/0.01/23, dsn=4.4.2, status=deferred (lost connection with localhost[127.0.0.1] while sending end of data -- message may be sent more than once)
Nov  9 14:04:11 pwmail002 postfix/lmtp[16792]: 06BB322C8C: to=<user2@domain.de>, relay=localhost[127.0.0.1]:2003, delay=681, delays=657/0.63/0.01/23, dsn=4.4.2, status=deferred (lost connection with localhost[127.0.0.1] while sending end of data -- message may be sent more than once)
Nov  9 14:04:11 pwmail002 postfix/lmtp[16792]: 06BB322C8C: to=<user3@domain.de>, relay=localhost[127.0.0.1]:2003, delay=681, delays=657/0.63/0.01/23, dsn=4.4.2, status=deferred (lost connection with localhost[127.0.0.1] while sending end of data -- message may be sent more than once)
Nov  9 14:04:11 pwmail002 postfix/lmtp[16792]: 06BB322C8C: to=<user4@domain.de>, relay=localhost[127.0.0.1]:2003, delay=681, delays=657/0.63/0.01/23, dsn=4.4.2, status=deferred (lost connection with localhost[127.0.0.1] while sending end of data -- message may be sent more than once)
Nov  9 14:04:11 pwmail002 postfix/lmtp[16792]: 06BB322C8C: to=<user5@domain.de>, relay=localhost[127.0.0.1]:2003, delay=681, delays=657/0.63/0.01/23, dsn=4.4.2, status=deferred (lost connection with localhost[127.0.0.1] while sending end of data -- message may be sent more than once)
Nov  9 14:04:11 pwmail002 postfix/lmtp[16792]: 06BB322C8C: to=<user6@domain.de>, relay=localhost[127.0.0.1]:2003, delay=681, delays=657/0.63/0.01/23, dsn=4.4.2, status=deferred (lost connection with localhost[127.0.0.1] while sending end of data -- message may be sent more than once)
Nov  9 14:04:11 pwmail002 postfix/lmtp[16792]: 06BB322C8C: to=<userX@domain.de>, relay=localhost[127.0.0.1]:2003, delay=681, delays=657/0.63/0.01/23, dsn=4.4.2, status=deferred (lost connection with localhost[127.0.0.1] while sending end of data -- message may be sent more than once)

Mails are dalivered multiple times without ending.
i need to delete the mailitem from /var/spool/postfix/defer/0 and /var/spool/postfix/defered/0

find /var/spool/postfix | grep "06BB322C8C"
./defer/0/06BB322C8C
./deferred/0/06BB322C8C

for e in $(find /var/spool/postfix | grep "06BB322C8C"); do rm -f $e ; done

this happend the 3rd time after upgrading on Sat 04.11.2017
everytime the distributiongroupds from ldap where used
before update everything was ok

//EDIT:
found this in my message.log:

Nov  9 13:53:47 pwmail002 kopano-dagent: pure virtual method called
Nov  9 13:53:47 pwmail002 kopano-dagent: terminate called without an active exception
Nov  9 13:53:48 pwmail002 abrt-hook-ccpp: Process 12948 (kopano-dagent) of user 0 killed by SIGABRT - dumping core
Nov  9 13:53:50 pwmail002 abrt-server: Package 'kopano-dagent' isn't signed with proper key
Nov  9 13:53:50 pwmail002 abrt-server: 'post-create' on '/var/spool/abrt/ccpp-2017-11-09-13:53:48-12948' exited with 1
Nov  9 13:53:50 pwmail002 abrt-server: Deleting problem directory '/var/spool/abrt/ccpp-2017-11-09-13:53:48-12948'

and for the other circular mails there are the same messages:

Nov  8 17:22:11 pwmail002 kopano-dagent: pure virtual method called
Nov  8 17:22:11 pwmail002 kopano-dagent: terminate called without an active exception
Nov  8 17:22:11 pwmail002 abrt-hook-ccpp: Process 15222 (kopano-dagent) of user 0 killed by SIGABRT - dumping core
Nov  8 17:22:12 pwmail002 abrt-server: Package 'kopano-dagent' isn't signed with proper key
Nov  8 17:22:12 pwmail002 abrt-server: 'post-create' on '/var/spool/abrt/ccpp-2017-11-08-17:22:11-15222' exited with 1
Nov  8 17:22:12 pwmail002 abrt-server: Deleting problem directory '/var/spool/abrt/ccpp-2017-11-08-17:22:11-15222'

coffee_is_life