<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div> <!--StartFragment--><div><div><div><div><div><div><div><div><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 class="Object" id="OBJ_PREFIX_DWT2133_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT2152_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT4259_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT4274_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT2284_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT2295_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3487_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3499_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3936_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3952_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT412_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT426_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3694_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3715_com_zimbra_date"><span class="Object" role="link" id="OBJ_PREFIX_DWT275_com_zimbra_date"><span class="Object" role="link" id="OBJ_PREFIX_DWT298_com_zimbra_date">Tuesday</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 class="Object" id="OBJ_PREFIX_DWT2134_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT2153_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT4260_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT4275_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT2285_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT2296_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3488_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3500_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3937_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3953_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT413_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT427_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3695_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3716_com_zimbra_url"><span class="Object" role="link" id="OBJ_PREFIX_DWT276_com_zimbra_url"><span class="Object" role="link" id="OBJ_PREFIX_DWT299_com_zimbra_url"><a href="https://www.freeconferencecall.com/wall/zetalliance" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank" data-mce-href="https://www.freeconferencecall.com/wall/zetalliance">https://www.freeconferencecall.com/wall/zetalliance</a></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 class="Object" id="OBJ_PREFIX_DWT2135_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT2154_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT4261_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT4276_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT2286_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT2297_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3489_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3501_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3938_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3954_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT414_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT428_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3696_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3717_com_zimbra_url"><span class="Object" role="link" id="OBJ_PREFIX_DWT277_com_zimbra_url"><span class="Object" role="link" id="OBJ_PREFIX_DWT300_com_zimbra_url"><a href="https://docs.google.com/document/d/1uUUDJpwp2CAylU6lxtbEdVcUX_qSbciyes6gLTWw2fY/edit" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer" target="_blank" data-mce-href="https://docs.google.com/document/d/1uUUDJpwp2CAylU6lxtbEdVcUX_qSbciyes6gLTWw2fY/edit">https://docs.google.com/document/d/1uUUDJpwp2CAylU6lxtbEdVcUX_qSbciyes6gLTWw2fY/edit</a></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br></li><li>A copy of each week’s summary is also posted to the Zimbra Forums:<ul><li><span class="Object" id="OBJ_PREFIX_DWT2140_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT2159_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT4266_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT4281_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT2291_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT2302_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3494_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3506_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3941_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3957_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT417_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT431_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3699_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3720_com_zimbra_date"><span class="Object" role="link" id="OBJ_PREFIX_DWT278_com_zimbra_date"><span class="Object" role="link" id="OBJ_PREFIX_DWT301_com_zimbra_date">April 2020</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span>: <span class="Object" id="OBJ_PREFIX_DWT2141_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT2160_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT4267_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT4282_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT2292_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT2303_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3495_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3507_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3942_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3958_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT418_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT432_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3700_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3721_com_zimbra_url"><span class="Object" role="link" id="OBJ_PREFIX_DWT279_com_zimbra_url"><span class="Object" role="link" id="OBJ_PREFIX_DWT302_com_zimbra_url"><a href="https://forums.zimbra.org/viewtopic.php?f=9&t=68073" rel="nofollow noopener noreferrer nofollow noopener noreferrer nofollow noopener noreferrer 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=68073">https://forums.zimbra.org/viewtopic.php?f=9&t=68073</a></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br></li><li><span class="Object"><span class="Object" id="OBJ_PREFIX_DWT3943_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3959_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT419_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT433_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3701_com_zimbra_date"><span class="Object" id="OBJ_PREFIX_DWT3722_com_zimbra_date"><span class="Object" role="link" id="OBJ_PREFIX_DWT280_com_zimbra_date"><span class="Object" role="link" id="OBJ_PREFIX_DWT303_com_zimbra_date">May 2020</span></span></span></span></span></span></span></span>:</span><span style="color: #0000ff;" data-mce-style="color: #0000ff;"> <span class="Object" id="OBJ_PREFIX_DWT3944_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3960_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT420_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT434_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3702_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3723_com_zimbra_url"><span class="Object" role="link" id="OBJ_PREFIX_DWT281_com_zimbra_url"><span class="Object" role="link" id="OBJ_PREFIX_DWT304_com_zimbra_url"><a href="https://forums.zimbra.org/viewtopic.php?f=9&t=68214" rel="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=68214"><span style="color: #000000;" data-mce-style="color: #000000;"><span style="font-family: 'arial', sans-serif;" data-mce-style="font-family: 'arial', sans-serif;"><span style="text-decoration: none;" data-mce-style="text-decoration: none;"></span></span></span></a></span></span></span></span></span></span></span></span><span class="Object" id="OBJ_PREFIX_DWT3945_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3961_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT421_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT435_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3703_com_zimbra_url"><span class="Object" id="OBJ_PREFIX_DWT3724_com_zimbra_url"><span class="Object" role="link" id="OBJ_PREFIX_DWT282_com_zimbra_url"><span class="Object" role="link" id="OBJ_PREFIX_DWT305_com_zimbra_url"><a href="https://forums.zimbra.org/viewtopic.php?f=9&t=68214" rel="noopener 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=68214">https://forums.zimbra.org/viewtopic.php?f=9&t=68214</a></span></span></span></span></span></span></span></span></span><span style="color: #0000ff;" data-mce-style="color: #0000ff;"></span><br><span class="Object"></span></li><li><span class="Object" role="link" id="OBJ_PREFIX_DWT283_com_zimbra_date"><span class="Object" role="link" id="OBJ_PREFIX_DWT306_com_zimbra_date">June 2020</span></span>: <span class="Object" role="link" id="OBJ_PREFIX_DWT284_com_zimbra_url"><span class="Object" role="link" id="OBJ_PREFIX_DWT307_com_zimbra_url"><a href="https://forums.zimbra.org/viewtopic.php?f=9&t=68342" target="_blank" rel="nofollow noopener noreferrer" data-mce-href="https://forums.zimbra.org/viewtopic.php?f=9&t=68342">https://forums.zimbra.org/viewtopic.php?f=9&t=68342</a></span></span><br data-mce-bogus="1"></li></ul></li><li>Constructive feedback on these call summaries is always welcome.</li></ul></div></div></div></div></div></div></div></div><!--EndFragment--> </div><div><br data-mce-bogus="1"></div><div>June 9, 2020 Conference Call Summary<br><br><strong>Breaking Changes In Zimbra Patches</strong><br>Marc G. commented that he found that after upgrading to 8.8.15 Patch 10 that his Crontab jobs on his Zimbra servers began failing. Upon investigating, he found it was due to breaking changes introduced to the NG Module command line syntax in Patch 10, as described in the release notes for the Patch. He explained that he felt it is problematic to introduce breaking changes in patches, and suggested that these types of changes should be reserved for Zimbra version upgrades.<br><br><strong>Zimbra Docs Issue</strong><br>Mark S. reported seeing an error in the Zimbra Web Client related to Zimbra Docs which said “This is an unsupported version of Zimbra Docs. To avoid the impression that it is suitable for deployment in enterprises, this message appears when more than 50 documents or 200 connections are in use concurrently.” Cine suggested that Mark opens a Zimbra Support case so it can be escalated to the Zextras development team. Mark confirmed that he opened Zimbra support case number 01011586 related to this issue.<br><br><strong>LDAP Multi-Master Replication In Zimbra</strong><br>Mark G. said that he was considering deploying Multi-Master Replication (MMR) for his LDAP servers in Zimbra (<a href="https://wiki.zimbra.com/wiki/LDAP_Multi_Master_Replication">https://wiki.zimbra.com/wiki/LDAP_Multi_Master_Replication</a>) and asked the opinions of those on the call about their experiences with MMR. Mark S. said that he is aware of one weak point in MMR, which requires that all LDAP master servers continuously have their clocks in near perfect sync with each other. He explained that he has been able to achieve this by running the Chrony service on his LDAP servers. He added that with MMR, he finds it easier to phase LDAP servers in or out of his Zimbra environment, since the only requirement is to change the replication agreements between LDAP servers. He also added that it is possible to run MMR in conjunction with read-only replicas. Mark suggested setting the zmlocalconfig values of ldap_url and ldap_master_url differently on each Zimbra server so that each uses a different preferred order of LDAP servers to evenly spread requests across LDAP servers.<br><br>John E. added that another reason to use MMR with replicas, is that it lowers the load on the LDAP master servers, since the replicas can be used for all read-only LDAP requests in Zimbra, while the masters are only needed for LDAP write requests. He recommended adding one or more SSDB servers (https://zimbra.github.io/zimbra-9/adminguide.html#_configuring_a_running_zimbra_collaboration_to_use_ssdb), as this will further reduce load on the LDAP servers. Randy L. commented that another benefit of running MMR is that it makes it much easier to do online Zimbra patches and upgrades without needing to take his entire Zimbra cluster offline. He said that the only time he will take his Zimbra cluster offline is when the release notes for a patch or upgrade require a major LDAP schema update.<br><br><strong>How Zimbra Handles LDAP Server Failures</strong><br>Marc G. asked if Zimbra will experience performance issues should LDAP replication fail. John E. said that it may not slow down Zimbra, but it will result in a split-brain scenario, where each LDAP server has conflicting data that will lead to a series of other related problems.<br><br>Noah P. asked what happens if an LDAP server is still pingable by a Zimbra mailbox or MTA server, but does not respond correctly to an LDAP request. Randy L. said that Zimbra does not seem to be able to recognize when an invalid LDAP response is received, and continues to try to use a bad LDAP server as long as the LDAP service is still listening and the server is pingable. John E. commented that there is some more development work to be done in this area to make Zimbra more resilient to LDAP server failures.<br><br><strong>Sending Email With Outlook Personas And The Zimbra Connector</strong><br>Randy L. shared an issue encountered by one of his customers running Outlook with multiple personas configured, along with the Zimbra Connector for Outlook (ZCO). The customer said that after upgrading from ZCO 8.8.15 Build 1837 to any later build of ZCO 8.8.15 or ZCO 9.0, prior to ZCO 9.0 Build 1876, the customer encountered the error “permission denied: can not access account user@domain.com” when attempting to send email via some, but not all of his Outlook personas. The customer found that ZCO 9.0 Build 1876 contains a fix for this issue, which is undocumented in the release notes for this ZCO version. John E. commented that the improvements in the recent releases of ZCO are a direct outcome of all of the feedback that Synacor has recently received from Zimbra partners.<br><br><strong>Feedback On The New Zimbra Patch Release Notes Format</strong><br>Randy L. commented that he liked the inclusion of the Jira tickets fixed in the release notes for 8.8.15 Patch 10 (<a href="https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P10#Jira_Summary">https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P10#Jira_Summary</a>) and 9.0 Patch 3 (<a href="https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P3#Jira_Summary">https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P3#Jira_Summary</a>). Mark S. agreed and said that it is also helpful from a marketing perspective to see which parts of Zimbra are being actively worked on. John W. also agreed the list of Jira tickets fixed is helpful. John E. said that in the 9.0 Patch 3 release notes, any Jira ticket preceded with the identifier “PREAPPS-(number)” in the Jira list relates to an improvement or fix in the Zimbra 9.0 Modern UI. He also explained that with the Jira ticket numbers, it makes it possible to see the commit history for a Jira ticket in Zimbra’s Github repos, but that the only challenge is in finding the corresponding Zimbra Github repo, since Zimbra currently uses many Github repos.<br><br><strong>Protecting The Postfix Submission Port In Zimbra From Abuse</strong><br>Mark S. shared a blog post that he recently wrote related to protecting the Postifx submission port in Postfix (TCP 587) within Zimbra from brute force password guessing attacks: <a href="https://www.missioncriticalemail.com/2020/06/08/zimbra-fail2ban-for-submission-only/">https://www.missioncriticalemail.com/2020/06/08/zimbra-fail2ban-for-submission-only/</a></div><div><br></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 )">randy@skywaynetworks.com</span> <span style="color:rgb( 255 , 102 , 0 )">)</span></span><br><span style="color:rgb( 0 , 0 , 153 )">Skyway Networks, LLC</span><br></div></div></div></div></div></body></html>