Only first address in CC: field receives message.

When sending a message with multiple users in CC: field, only the first user receives a message with contents. All additional users listed in CC: field receive notification that a message has arrived with the subject - but when they open the message, it is blank…

I am using
Outlook 2010
Zarafa-client 7.2.4-52167
Kopano 8.5.5.5.0
postfix 3.1.0-3ubuntu0.3

When I open the user’s mailbox in the web-app, the message does not appear to exist
I have reviewed logs, and have not found anything obvious. Any help would be appreciated.

Update. This issue has become annoying again. I have found the following entries in logs.
This occurred after a user CC; 6 users on an email

kopano/server.log:
BEGIN PASTE--------->
Mon Nov 19 15:16:12 2018: [error ] SQL [00000031] Failed: Deadlock found when trying to get lock; try restarting transaction, Query Size: 165, Query: “REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TJ\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�T��\0\0\0’, 0, 0)”
Mon Nov 19 15:16:12 2018: [error ] KDatabase::I_Update() query failed: REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TJ\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�T��\0\0\0’, 0, 0): Deadlock found when trying to get lock; try restarting transaction
Mon Nov 19 15:16:12 2018: [error ] SQL [00000015] Failed: Deadlock found when trying to get lock; try restarting transaction, Query Size: 165, Query: “REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TF\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�T�
\0\0\0’, 0, 0)”
Mon Nov 19 15:16:12 2018: [error ] KDatabase::I_Update() query failed: REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TF\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�T�
\0\0\0’, 0, 0): Deadlock found when trying to get lock; try restarting transaction
Mon Nov 19 15:16:12 2018: [error ] SQL [00000036] Failed: Deadlock found when trying to get lock; try restarting transaction, Query Size: 166, Query: “REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TD\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�TF\�\0\0\0’, 0, 0)”
Mon Nov 19 15:16:12 2018: [error ] KDatabase::I_Update() query failed: REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TD\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�TF\�\0\0\0’, 0, 0): Deadlock found when trying to get lock; try restarting transaction
Mon Nov 19 15:16:12 2018: [error ] SQL [00000013] Failed: Deadlock found when trying to get lock; try restarting transaction, Query Size: 166, Query: “REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TE\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�T\�\0\0\0’, 0, 0)”
Mon Nov 19 15:16:12 2018: [error ] KDatabase::I_Update() query failed: REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TE\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�T\�\0\0\0’, 0, 0): Deadlock found when trying to get lock; try restarting transaction
Mon Nov 19 15:16:12 2018: [error ] SQL [00000039] Failed: Deadlock found when trying to get lock; try restarting transaction, Query Size: 165, Query: “REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TH\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�Tl�\0\0\0’, 0, 0)”
Mon Nov 19 15:16:12 2018: [error ] KDatabase::I_Update() query failed: REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TH\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�Tl�\0\0\0’, 0, 0): Deadlock found when trying to get lock; try restarting transaction
Mon Nov 19 15:16:12 2018: [error ] SQL [00000019] Failed: Deadlock found when trying to get lock; try restarting transaction, Query Size: 167, Query: “REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TL\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�T\�\�\0\0\0’, 0, 0)”
Mon Nov 19 15:16:12 2018: [error ] KDatabase::I_Update() query failed: REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TL\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�T\�\�\0\0\0’, 0, 0): Deadlock found when trying to get lock; try restarting transaction
Mon Nov 19 15:16:12 2018: [error ] SQL [00000025] Failed: Deadlock found when trying to get lock; try restarting transaction, Query Size: 165, Query: “REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TI\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�T��
\0\0\0’, 0, 0)”
Mon Nov 19 15:16:12 2018: [error ] KDatabase::I_Update() query failed: REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TI\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�T��
\0\0\0’, 0, 0): Deadlock found when trying to get lock; try restarting transaction
Mon Nov 19 15:16:12 2018: [error ] SQL [00000014] Failed: Deadlock found when trying to get lock; try restarting transaction, Query Size: 166, Query: “REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TK\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�T\��
\0\0\0’, 0, 0)”
Mon Nov 19 15:16:12 2018: [error ] KDatabase::I_Update() query failed: REPLACE INTO changes(change_type, sourcekey, parentsourcekey, sourcesync, flags) VALUES (4097, ‘Վ�\�J\�J{���ײ\�TK\�\0\0\0’, ‘Վ�\�J\�J{���ײ\�T\��
\0\0\0’, 0, 0): Deadlock found when trying to get lock; try restarting transaction
<---------END PASTE

mail.log
BEGIN PASTE --------->

Nov 19 15:16:11 redactedmailservername postfix/smtpd[7845]: connect from localhost[127.0.0.1]
Nov 19 15:16:11 redactedmailservername postfix/smtpd[7845]: EC6771EA001: client=localhost[127.0.0.1]
Nov 19 15:16:11 redactedmailservername postfix/cleanup[7847]: EC6771EA001: message-id=kcim.5bf31a0b.1efb.3bb58b4226d596a7@redactedmailservername.FRFCanada.local
Nov 19 15:16:11 redactedmailservername postfix/qmgr[3131]: EC6771EA001: from=corrina@redacteddomain.com, size=11616, nrcpt=9 (queue active)
Nov 19 15:16:11 redactedmailservername postfix/smtpd[7845]: disconnect from localhost[127.0.0.1] ehlo=1 mail=1 rcpt=9 data=1 quit=1 commands=13
Nov 19 15:16:11 redactedmailservername postfix/local[7935]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Nov 19 15:16:11 redactedmailservername postfix/local[7937]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Nov 19 15:16:11 redactedmailservername postfix/local[7938]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Nov 19 15:16:12 redactedmailservername postfix/local[7940]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Nov 19 15:16:12 redactedmailservername postfix/local[7942]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Nov 19 15:16:12 redactedmailservername postfix/local[7945]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Nov 19 15:16:12 redactedmailservername postfix/local[7949]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Nov 19 15:16:12 redactedmailservername postfix/pipe[7968]: EC6771EA001: to=donk@redacteddomain.com, relay=kopano, delay=0.68, delays=0.01/0.02/0/0.65, dsn=2.0.0, status=sent (delivered via kopano service)
Nov 19 15:16:12 redactedmailservername postfix/pipe[7946]: EC6771EA001: to=accounts@redacteddomain.com, relay=kopano, delay=0.68, delays=0.01/0.01/0/0.66, dsn=2.0.0, status=sent (delivered via kopano service)
Nov 19 15:16:12 redactedmailservername postfix/pipe[7963]: EC6771EA001: to=partsdesk@redacteddomain.com, relay=kopano, delay=0.7, delays=0.01/0.04/0/0.65, dsn=2.0.0, status=sent (delivered via kopano service)
Nov 19 15:16:12 redactedmailservername postfix/pipe[7893]: EC6771EA001: to=don@redacteddomain.com, relay=kopano, delay=0.7, delays=0.01/0.02/0/0.68, dsn=2.0.0, status=sent (delivered via kopano service)
Nov 19 15:16:12 redactedmailservername postfix/pipe[7972]: EC6771EA001: to=skyeb@redacteddomain.com, relay=kopano, delay=0.71, delays=0.01/0.06/0/0.64, dsn=2.0.0, status=sent (delivered via kopano service)
Nov 19 15:16:12 redactedmailservername postfix/pipe[7865]: EC6771EA001: to=aaron@redacteddomain.com, relay=kopano, delay=0.71, delays=0.01/0.01/0/0.69, dsn=2.0.0, status=sent (delivered via kopano service)
Nov 19 15:16:12 redactedmailservername postfix/pipe[7970]: EC6771EA001: to=mark@redacteddomain.com, relay=kopano, delay=0.72, delays=0.01/0.03/0/0.68, dsn=2.0.0, status=sent (delivered via kopano service)
Nov 19 15:16:12 redactedmailservername postfix/pipe[7955]: EC6771EA001: to=felix@redacteddomain.com, relay=kopano, delay=0.73, delays=0.01/0.02/0/0.7, dsn=2.0.0, status=sent (delivered via kopano service)
Nov 19 15:16:12 redactedmailservername postfix/pipe[7951]: EC6771EA001: to=rolf@redacteddomain.com, relay=kopano, delay=0.73, delays=0.01/0.05/0/0.67, dsn=2.0.0, status=sent (delivered via kopano service)
Nov 19 15:16:12 redactedmailservername postfix/qmgr[3131]: EC6771EA001: removed
<--------END PASTE