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<p>Hi Randy,</p>
<p>Thanks for bringing the calendar issue to John's attention during
the last call and sorry for not reading your report earlier than
today. I like to keep them unread until I have enough time to read
them carefully. :-)</p>
<p>I realize I may not have been clear enough regarding this
calendar issue. The issue appears because of the way Zimbra
synchronizes calendars. Suppose there's an event in Calendar (A)
<a class="moz-txt-link-freetext" href="https://timetable.myuniversity.com/calendar/year_1/group_A/calendar.ics">https://timetable.myuniversity.com/calendar/year_1/group_A/calendar.ics</a>
that's also in Calendar (B)
<a class="moz-txt-link-freetext" href="https://timetable.myuniversity.com/calendar/year_1/group_B/calendar.ics">https://timetable.myuniversity.com/calendar/year_1/group_B/calendar.ics</a>.
If Zimbra synchronizes Calendar (A) before Calendar (B), then the
event will only be downloaded once in Calendar (A) and will not be
downloaded in Calendar (B) despite it's actually part of Calendar
(B). The event will just be skipped on Calendar (B)
synchronization and will not be considered in Calendar (B) at all.<br>
</p>
<p>As a result, if Zimbra user chooses to display only Calendar (B)
and not Calendar (A) in the Zimbra Web Client, then the common
event will not appear on the Calendar view at all. And that's the
issue.<br>
The common event should be synchronized in both/all Calendars that
contains it so that it can be displayed in the ZWC calendar view
whatever the calendar is ticked.<br>
</p>
<p>I've just been notified today by Zimbra's support that my case
has resulted in a Bug (ZBUG-2097) so I hope it will be fixed one
day.</p>
<p>Kind regards,</p>
<p>Frédéric.<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Le 22/01/2021 à 20:52, Randy Leiker a
écrit :<br>
</div>
<blockquote type="cite"
cite="mid:1215526173.1757276.1611345157389.JavaMail.zimbra@skywaynetworks.com">
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<div>Hello Zeta Alliance Community,<br>
<br>
Here is a summary of this week’s
conference call. A few brief
reminders:<br>
</div>
<ul>
<li>Conference calls are every <span
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id="OBJ_PREFIX_DWT110_com_zimbra_date"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1182_com_zimbra_date"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1199_com_zimbra_date">Tuesday</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>
and open to all using either the
FreeConferenceCall.com VoIP app
or via a dial-in number: <span
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class="Object"
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class="Object"
id="OBJ_PREFIX_DWT4432_com_zimbra_url"><span class="Object"
id="OBJ_PREFIX_DWT4446_com_zimbra_url"><span
class="Object"
id="OBJ_PREFIX_DWT2541_com_zimbra_url"><span class="Object"
id="OBJ_PREFIX_DWT2558_com_zimbra_url"><span
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id="OBJ_PREFIX_DWT111_com_zimbra_url"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1183_com_zimbra_url"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1200_com_zimbra_url"><a
href="https://www.freeconferencecall.com/wall/zetalliance" rel="nofollow
noopener
noreferrer
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noreferrer"
target="_blank"
data-mce-href="https://www.freeconferencecall.com/wall/zetalliance"
moz-do-not-send="true">https://www.freeconferencecall.com/wall/zetalliance</a></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br>
</li>
<li>Each week’s call agenda can be
found at: <span style="color:
#000080;"><span
style="font-family: Arial,
sans-serif;"><span
style="font-size: medium;"
data-mce-style="font-size:
medium;"><span lang="zxx"><u><a class="moz-txt-link-freetext" href="https://drive.google.com/drive/folders/1xDyBJFjnfZYxuXJHiDzsXjjMuGGtIl7J">https://drive.google.com/drive/folders/1xDyBJFjnfZYxuXJHiDzsXjjMuGGtIl7J</a></u></span></span></span></span><br>
</li>
<li>A copy of each week’s summary
is also posted to the Zimbra
Forums:<br>
<span class="Object"></span>
<ul>
<li><span class="Object">All
Prior Months: <span
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class="Object"
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class="Object"
id="OBJ_PREFIX_DWT113_com_zimbra_url"><span class="Object" role="link"
id="OBJ_PREFIX_DWT1185_com_zimbra_url"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1202_com_zimbra_url"><a
href="https://forums.zimbra.org/viewforum.php?f=9" rel="nofollow
noopener
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target="_blank"
data-mce-href="https://forums.zimbra.org/viewforum.php?f=9"
moz-do-not-send="true">https://forums.zimbra.org/viewforum.php?f=9</a></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br>
</span></li>
<li><span style="font-family:
'arial', sans-serif;"
data-mce-style="font-family:
'arial', sans-serif;"><span
style="font-size:
medium;"
data-mce-style="font-size:
medium;"><span
lang="zxx"><span
class="Object"><span
class="Object"
id="OBJ_PREFIX_DWT6024_com_zimbra_date"><span
class="Object"
id="OBJ_PREFIX_DWT6043_com_zimbra_date"><span
class="Object"
id="OBJ_PREFIX_DWT4437_com_zimbra_date"><span class="Object"
id="OBJ_PREFIX_DWT4451_com_zimbra_date"><span
class="Object"
id="OBJ_PREFIX_DWT2546_com_zimbra_date"><span class="Object"
id="OBJ_PREFIX_DWT2563_com_zimbra_date"><span
class="Object"
id="OBJ_PREFIX_DWT98_com_zimbra_date"><span class="Object"
id="OBJ_PREFIX_DWT114_com_zimbra_date"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1186_com_zimbra_date"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1203_com_zimbra_date">December
2020</span></span></span></span></span></span></span></span></span></span>:
<span class="Object"
id="OBJ_PREFIX_DWT6025_com_zimbra_url"><span class="Object"
id="OBJ_PREFIX_DWT6044_com_zimbra_url"><span
class="Object"
id="OBJ_PREFIX_DWT4438_com_zimbra_url"><span class="Object"
id="OBJ_PREFIX_DWT4452_com_zimbra_url"><span
class="Object"
id="OBJ_PREFIX_DWT2547_com_zimbra_url"><span class="Object"
id="OBJ_PREFIX_DWT2564_com_zimbra_url"><span
class="Object"
id="OBJ_PREFIX_DWT99_com_zimbra_url"><span class="Object"
id="OBJ_PREFIX_DWT115_com_zimbra_url"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1187_com_zimbra_url"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1204_com_zimbra_url"><a
href="https://forums.zimbra.org/viewtopic.php?f=9&t=69008"
rel="nofollow
noopener
noreferrer
nofollow
noopener
noreferrer
nofollow
noopener
noreferrer
nofollow
noopener
noreferrer
nofollow
noopener
noreferrer
nofollow
noopener
noreferrer"
target="_blank"
data-mce-href="https://forums.zimbra.org/viewtopic.php?f=9&t=69008"
moz-do-not-send="true">https://forums.zimbra.org/viewtopic.php?f=9&t=69008</a></span></span></span></span></span></span></span></span></span></span><br>
</span></span></span></span></li>
<li><span style="font-family:
'arial', sans-serif;"
data-mce-style="font-family:
'arial', sans-serif;"><span
style="font-size:
medium;"
data-mce-style="font-size:
medium;"><span
lang="zxx"><span
class="Object"><span
class="Object"
id="OBJ_PREFIX_DWT100_com_zimbra_date"><span
class="Object"
id="OBJ_PREFIX_DWT116_com_zimbra_date"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1188_com_zimbra_date"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1205_com_zimbra_date">January
2021</span></span></span></span>:
<span class="Object"
id="OBJ_PREFIX_DWT101_com_zimbra_url"><span class="Object"
id="OBJ_PREFIX_DWT117_com_zimbra_url"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1189_com_zimbra_url"><span
class="Object"
role="link"
id="OBJ_PREFIX_DWT1206_com_zimbra_url"><a
href="https://forums.zimbra.org/viewtopic.php?f=9&t=69121"
rel="nofollow
noopener
noreferrer
nofollow
noopener
noreferrer
nofollow
noopener
noreferrer"
target="_blank"
data-mce-href="https://forums.zimbra.org/viewtopic.php?f=9&t=69121"
moz-do-not-send="true">https://forums.zimbra.org/viewtopic.php?f=9&t=69121</a></span></span></span></span><br>
</span></span></span></span></li>
</ul>
</li>
<li>Constructive feedback on these
call summaries is always
welcome.</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<div><span class="Object"
id="OBJ_PREFIX_DWT2548_com_zimbra_date"><span
class="Object"
id="OBJ_PREFIX_DWT2565_com_zimbra_date"><span
class="Object"
id="OBJ_PREFIX_DWT102_com_zimbra_date"><span
class="Object"
id="OBJ_PREFIX_DWT118_com_zimbra_date"><span
class="Object" role="link"
id="OBJ_PREFIX_DWT1190_com_zimbra_date"><span
class="Object" role="link"
id="OBJ_PREFIX_DWT1207_com_zimbra_date">January
19</span></span></span></span></span></span>,
2021</div>
</div>
</div>
<!--EndFragment--></div>
<div><br>
<strong>Setting A Maximum Message Size Per Domain</strong><br>
Noah P. said that he is looking for a means to enforce a
maximum email size limit per Zimbra domain. He explained that
he has two customers that want to keep email messages within
their organizations smaller than they are now, and Noah does
not wish to apply the lower size limit to all other customer
domains on his Zimbra servers, but rather just to those two
customer’s domains. Cine suggested that CBPolicyd ( <a
href="https://wiki.zimbra.com/wiki/How-to_for_cbpolicyd"
moz-do-not-send="true">https://wiki.zimbra.com/wiki/How-to_for_cbpolicyd</a>
) might be of help, and said that he knows CBPolicyd can set a
maximum outbound message size limit, but was not certain if it
was possible to set an inbound message size limit too. Mark
S. suggested that Noah could setup a new Zimbra MTA server
specifically for the customers requesting the lower message
size limit, then route all of the email for those two
customers through the new MTA server. Matthew F. said that
writing a Postfix Milter to filter based on message size might
work, but the downside to this approach would be that messages
that are too large would bounce to the sender only after
Zimbra initially accepts the messages for delivery. Matthew
also pointed out that in doing a quick Telnet connection test
to his Zimbra MTA server, he noticed that Postfix advertises
the maximum message size accepted immediately after the
HELO/EHLO command is sent, suggesting that it may only be
practical to have a server-wide message size limit set, as
compared to a per domain setting, assuming that all of the
users are using the same Zimbra MTA server.<br>
<br>
<strong>Resetting Mailbox Passwords When Two-Factor
Authentication Is Enabled</strong><br>
John E. shared an update on an issue discussed in an earlier
Zeta Alliance call related to difficulties encountered when
attempting to use the Zimbra password reset feature for a
mailbox with two-factor authentication enabled. He said that
this has been acknowledged by Zimbra as a bug (ZCS-10191;
status updates are not available via the Zimbra Support
Portal) and is anticipated to be fixed in an upcoming patch
that should be released soon. Noah P. asked if the bug fix
will only apply to the Modern UI, the Classic UI, or both in
Zimbra 9. John E. said that the bug fix is associated with
the server back-end, so he thinks it should apply to both the
Modern and Classic UIs.<br>
<br>
<strong>Using Shared Calendars Containing The Same Calendar
Event UIDs</strong><br>
From the Zeta Alliance mailing list, Frederic N. said that he
has Zimbra users who have multiple shared calendars, and they
often add the same calendar events to these multiple shared
calendars with the same UID number. His users report that
when their email clients are configured to synchronize each of
these shared calendars, they expect the calendar events with
the same UID number to appear for each shared calendar, but
the actual behavior observed is that the calendar events
appear only once on a single shared calendar – usually the
shared calendar that synchronizes first. He wondered if this
occurs because of the de-duplication feature in Zimbra that
also avoids repeatedly delivering email messages with the same
message ID number. Cine said that Frederic did not mention
which email clients are in use by the users, but generally it
is up to each email client to decide on which calendar events
they will download, rather than the Zimbra server. He did not
think that the de-duplication feature in Zimbra was involved,
as that feature only applies to email deliveries. John H.
added that most email clients will consider calendar events
with the same UID to be the same calendar event, thereby
causing the event to be displayed only once within the email
client, even if it appears on multiple shared calendars on the
server-side. He said that for ActiveSync clients, it is up to
the client to decide on how to display calendar events with
the same UID, as either a single event, or multiple events.<br>
<br>
<strong>Non-Responsive Mailboxd Process and AWS Storage
Buckets</strong><br>
Mark S. shared that he recently experienced an issue with one
of his Zimbra mailbox servers where none of the users could
access their mailboxes, but the mailboxd processes and its
dependencies were running with a load of 120%. After a
restart of the mailboxd and related services, users still
could not access their mailboxes. With Zimbra Support’s
assistance, the issue was pinpointed to a problem with
mailboxd accessing the AWS storage buckets containing his
Zimbra server’s disk volumes. He said that when using AWS
storage buckets as Zimbra volumes, he used to be able to
create a primary/secondary volume without also needing to
create a logical representation in Zextras of the external AWS
S3 storage bucket. But, he discovered that now this is
required. Cine said that about one year ago, the Zimbra
Administration UI changed to add support for some updates to
the supported volume types, but the Zextras back-end CLI did
not. He said that it should now no longer be possible to
create a Zimbra volume without a corresponding AWS S3 bucket.
When using AWS buckets for Zimbra volumes, Cine recommended
running these CLI commands:<br>
</div>
<ul>
<li>“zxsuite hsm getAllVolumes” to get the
bucketConfigurationId value, then run:</li>
<li>“zxsuite hsm listBuckets” to see the actual
bucketConfigurationId for your actual buckets.</li>
<li>If your primary or secondary storage volume references a
non-existent bucket ID, you may need to run “zxsuite hsm
doUpdateVolume …” to fix.</li>
</ul>
<div><strong>Using Smart Hosts In Zimbra To Manage Outbound
Email Routing</strong><br>
Noah P. re-visited a topic from the November 10th Zeta
Alliance call ( <a
href="https://forums.zimbra.org/viewtopic.php?f=9&t=68942#p299710"
moz-do-not-send="true">https://forums.zimbra.org/viewtopic.php?f=9&t=68942#p299710</a>
) related to controlling SMTP mail flow in Zimbra per domain.
He said he had been continuing to experiment with this
capability by working with using the Zimbra Smart Hosts
feature to attempt to direct mail per domain through specific
Zimbra MTAs. Mark S. suggested that Noah should use the
“zimbraSmtpHostname” setting per domain for this purpose, but
Noah said this setting only works for users who access their
mailboxes with the SOAP clients, such as the Zimbra Connector
for Outlook and ActiveSync. Noah has observed that the Zimbra
Web Client, SMTP (IMAP/POP) clients, mailbox forwarders, and
distribution lists still continue to use the Zimbra global MTA
setting, ignoring the per domain “zimbraSmtpHostname”
setting. Cine suggested using Postfix’s
“sender_dependent_relayhost_maps” attribute in addition to the
“zimbraSmtpHostname” setting to help ensure consistency for
each user’s email client use case. John H. suggested that
Noah should also create a Zimbra request for enhancement to
make this capability part of Zimbra’s official features.<br>
<br>
<strong>“Host or domain name not found” Errors During Zimbra
Server Migration</strong><br>
Matthew F. said that he is working on a customer migration
from an old to a new Zimbra server version. He said that
after a mailbox is moved from the old to the new server, the
LMTP server address for the mailbox, that Zimbra uses for mail
delivery, is updated to the new server’s fully qualified
domain name (FQDN) as expected, but email deliveries sent from
mailboxes on the old server to the mailbox on the new server
result in “status=bounced (Host or domain name not found. Name
service error for name=xxxx type=A: Host not found)” error
messages in mailbox.log. He found that after moving a mailbox
to the new Zimbra server, and changing the LMTP FQDN for a
mailbox to an IP address, this then allows for email to be
delivered normally. Noah P. wondered if Zimbra may be
checking the server’s local /etc/hosts file before using the
DNS resolver configured for the server, and the /etc/hosts
file contains an incorrect entry for the FQDN of the new
server. Mark S. said that he worked with a customer that had
a multi-homed Zimbra server, with one network interface
assigned to a public IP address, and another assigned to a
VPN. He found it very tricky to get mail routed correctly
with this setup and suggested using Postfix’s “lmtp=native”
setting. He said that without this setting, Postfix avoided
using the /etc/hosts file for look-ups and always used the DNS
resolver configured for the server. Cine suggested that
Matthew take a look at using dnsmasq as it makes these types
of scenarios much easier. Mark S. suggested taking a look at
his dnsmasq how-to ( <a
href="https://www.missioncriticalemail.com/2018/04/12/zimbra-dnsmasq-configuration-guide/"
moz-do-not-send="true">https://www.missioncriticalemail.com/2018/04/12/zimbra-dnsmasq-configuration-guide/</a>
) and said that dnsmasq is beneficial since it only answers
DNS queries for records it is specifically configured to
answer, and passes all other queries through to the server’s
regular DNS resolver. Noah P. also suggested the Zimbra
command: “zmlocalconfig -e postfix_lmtp_host_lookup=native”
which Matthew said he currently has enabled. Cine added that
using the /etc/nsswitch.conf file to set the order in which
DNS resolvers are used may help, such as this configuration
value: “hosts: files dns”. Mark S. said that this page ( <a
href="https://wiki.zimbra.com/wiki/Postconf_keys"
moz-do-not-send="true">https://wiki.zimbra.com/wiki/Postconf_keys</a>
) maps Postfix configuration settings to Zimbra-equivalent
settings may be of help too. Noah P. said that Matthew might
be looking for this Zimbra setting too:
“zimbraMtaLmtpHostLookup”, which can be described from the CLI
using: “zmprov desc -a zimbraMtaLmtpHostLookup”. Matthew F.
said he currently has this setting configured:
“zimbraMtaLmtpHostLookup: dns”.<br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div data-marker="__SIG_PRE__">
<div>
<div>
<div><span style="color:rgb( 255 , 102 , 0
);font-weight:bold"><br>
Randy Leiker (</span><span style="font-weight:bold"> <span
style="color:rgb( 51 , 51 , 255
);background-color:rgb( 255 , 255 , 255 )"><a class="moz-txt-link-abbreviated" href="mailto:randy@skywaynetworks.com">randy@skywaynetworks.com</a></span>
<span style="color:rgb( 255 , 102 , 0 )">)</span></span><br>
<span style="color:rgb( 0 , 0 , 153 )">Skyway Networks,
LLC</span><br>
<br>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</body>
</html>