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ZBUG-4827: Contact Ranking fetch causing slowness (Java Consumes 100% of CPU)

Last post by frompani « Thu Mar 12, 2026 8:30 am
Replies: 2
by L. Mark Stone » Tue Apr 22, 2025 2:08 pm

Zimbra have created ZBUG-4827 in response to a Support Case we opened where we observed Java was consuming 100% of a mailstore's CPU, sometimes for...

2 Replies

3137 Views

Last post by frompani
Thu Mar 12, 2026 8:30 am
Z-Push Zimbra

Last post by Dexter « Thu Mar 12, 2026 1:54 am
Replies: 1
by dibo69 » Wed Mar 16, 2022 7:46 pm

Hi,

made a new installation of Zimbra 8.8.15 and Z-Push Zimbra Backend.

Zimbra is working properly, but synchronization with z-push is extremely...

1 Replies

1526 Views

Last post by Dexter
Thu Mar 12, 2026 1:54 am
Inconsistent SMTP AUTH enforcement: Outlook vs Thunderbird

Last post by adrian.gibanel.btactic « Tue Mar 10, 2026 12:29 pm
Replies: 20
by asa » Tue Dec 30, 2025 8:40 am
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We are observing a serious inconsistency in how Zimbra enforces the authenticated sender depending on the mail client.

When a Zimbra mailbox is...
20 Replies

8344 Views

Last post by adrian.gibanel.btactic
Tue Mar 10, 2026 12:29 pm
Zimbra Out-of-Office: Different Auto-Reply per "To" Address?

Last post by oetiker « Mon Mar 09, 2026 10:12 am

by oetiker » Mon Mar 09, 2026 10:12 am

Hey everyone,

I'm running into a limitation with Zimbra's built-in Out-of-Office (Vacation) feature: it only allows you to set a single auto-reply...

0 Replies

470 Views

Last post by oetiker
Mon Mar 09, 2026 10:12 am
mailboxd webapps not starting after update

Last post by nopanic-systems « Fri Mar 06, 2026 5:54 pm
Replies: 3
by nopanic-systems » Fri Mar 06, 2026 1:28 pm

Hello all
ubunu20 zimbra 10.0.7
yesterday Idid an update via apt.
result is mailboxd webapps not starting after update.

in mailbox error log I...

3 Replies

501 Views

Last post by nopanic-systems
Fri Mar 06, 2026 5:54 pm
Zimbra Support Portal Misconfiguration - "Template: Notify: New Z assignment notification (to Z)" Emails Marked As Spam

Last post by L. Mark Stone « Tue Mar 03, 2026 4:18 pm

by L. Mark Stone » Tue Mar 03, 2026 4:18 pm

Support Portal Emails using this template are currently being marked as spam, due to the template being configured to send email as if it came from...

0 Replies

825 Views

Last post by L. Mark Stone
Tue Mar 03, 2026 4:18 pm
Java and Java GC Tuning

Last post by ghen « Sun Mar 01, 2026 9:51 am
Replies: 2
by L. Mark Stone » Fri Feb 27, 2026 1:57 am

After several weeks of iterative testing, we've published a blog post with our recommendations for tuning Java and the Java Garbage Collector on...

2 Replies

1088 Views

Last post by ghen
Sun Mar 01, 2026 9:51 am
Duplicate email uploads exceeding users quota - ZBUG-4613

Last post by ghen « Wed Feb 25, 2026 10:45 am
Replies: 13
by Matt » Wed Jan 08, 2025 10:29 am
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Hi all,

I have a support ticket open for this (case 01747918) which resulted in a bug being opened (ZBUG-4613). I'm wondering if anyone else is...
13 Replies

8346 Views

Last post by ghen
Wed Feb 25, 2026 10:45 am
Keep switching back to classic client – what features are missing for the final migration to modern web client?

Last post by dapa6 « Tue Feb 24, 2026 10:17 pm
Replies: 6
by oetiker » Thu Nov 20, 2025 8:08 am

Hi,

I've tried multiple times to switch to the modern web client permanently, but I keep reverting to the classic client because several important...

6 Replies

4528 Views

Last post by dapa6
Tue Feb 24, 2026 10:17 pm
Cannot Log In to Restores of Accounts With 2FA - Workaround Available

Last post by L. Mark Stone « Mon Feb 23, 2026 9:59 pm
Replies: 2
by L. Mark Stone » Mon Feb 16, 2026 8:37 pm

I had hoped this bug would have been fixed when the enhanced backup engine was released with 10.1.16, but regrettably not.

Issue:
When an account...

2 Replies

1533 Views

Last post by L. Mark Stone
Mon Feb 23, 2026 9:59 pm
Web GUI cbpolicyd Limits page is blank.

Last post by adrian.gibanel.btactic « Mon Feb 23, 2026 5:49 pm
Replies: 3
by someone » Sat Feb 21, 2026 8:16 pm

Hi,

I have installed cbpolicyd (with sqlite) years ago on our old Zimbra v.8 or so, (on old Ubuntu, v.16 or so) using the instructions on the page...

3 Replies

1040 Views

Last post by adrian.gibanel.btactic
Mon Feb 23, 2026 5:49 pm
Zimbra Daffodil (v10.1.16) file preview problem

Last post by yeak « Sat Feb 21, 2026 1:32 am
Replies: 6
by slava_ua » Wed Feb 11, 2026 7:32 am

Good morning!

I don't know what's wrong, but after updating Zimbra to 10.1.16, when I click on a file, the preview opens. However, when I click the...

6 Replies

2559 Views

Last post by yeak
Sat Feb 21, 2026 1:32 am
[SOLVED] LDAP bind, not access from lan IP

Last post by darkfader « Wed Feb 18, 2026 11:38 pm
Replies: 4
by 10114bart » Tue Apr 22, 2008 7:13 pm

Hello.
I need to access to the zimbra-ldap from the lan, to get access to the GAL from mail clients. The zimbra LDAP server refuse conection from the...

4 Replies

2470 Views

Last post by darkfader
Wed Feb 18, 2026 11:38 pm
zmbackup error

Last post by darkfader « Wed Feb 18, 2026 2:15 pm
Replies: 4
by bilalhussian » Tue Feb 27, 2024 10:43 am

I have installed zmbackup version 1.2.6 on zimbra 8.8 installed on centos 7.0. but when I try to take backup using the command zmbackup -f it gives...

4 Replies

2346 Views

Last post by darkfader
Wed Feb 18, 2026 2:15 pm
LDAP Admin Password: Not verified

Last post by darkfader « Wed Feb 18, 2026 1:35 pm
Replies: 24
by SuperLex » Thu Oct 25, 2018 2:43 pm
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Hello everybody,

I can't progress with my multi server intallation, I had install an LDAP Zimbra server and I would like to continue to install an...
24 Replies

16666 Views

Last post by darkfader
Wed Feb 18, 2026 1:35 pm
New Forum User Unable to Register?

Last post by btrent98 « Wed Feb 11, 2026 10:20 pm

by btrent98 » Wed Feb 11, 2026 10:20 pm

I have a co-worker who is trying to join this forum, but is having a weird issue. She registers and gets the confirmation email, but when she clicks...

0 Replies

1879 Views

Last post by btrent98
Wed Feb 11, 2026 10:20 pm
Slow down password bruteforce attack

Last post by yeak « Wed Feb 11, 2026 4:59 am

by yeak » Wed Feb 11, 2026 4:59 am

Hi all,

Zimbra has DoSFilter, see

There are still many password bruteforce attacks going on in 587, some in the gaps of seconds. It is as if the...

0 Replies

1795 Views

Last post by yeak
Wed Feb 11, 2026 4:59 am
slapd logging lots of CSN messages, related to z-push, ldap_common_loglevel seems not to work

Last post by Ace Suares « Mon Feb 09, 2026 11:38 am

by Ace Suares » Mon Feb 09, 2026 11:38 am

Hi,
syslog receives thousands of slapd CSN messages:

Feb 9 06:59:51 zimbra slapd : slap_graduate_commit_csn: removing 0x7fd4c01cfb20...

0 Replies

2118 Views

Last post by Ace Suares
Mon Feb 09, 2026 11:38 am
Ubuntu 24.04

Last post by BradC « Fri Feb 06, 2026 3:19 am

by BradC » Fri Feb 06, 2026 3:19 am

I did a few test installs on a staging machine. For whatever reason, Synacor has listed systemd-resolved as a dependency in zimbra-os-requirements...

0 Replies

2580 Views

Last post by BradC
Fri Feb 06, 2026 3:19 am
High scoring openssl vulnerability CVE-2025-15467 - install + reboot

Last post by zmcontrol « Wed Feb 04, 2026 9:33 pm
Replies: 10
by halfgaar » Wed Jan 28, 2026 7:56 pm
1

2
Just in case people missed it:

I'm not sure if the particular subsystem is part of a normal TLS hand port, but better safe than sorry.

Better...
10 Replies

4461 Views

Last post by zmcontrol
Wed Feb 04, 2026 9:33 pm
Autocomplete behaviour change between 9.0 and 10.1

Last post by 7224jobe « Tue Jan 27, 2026 2:51 pm
Replies: 32
by Klug » Fri Jun 13, 2025 1:02 pm
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2

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Hello.

I've been working on some upgrade from 9.0 to 10.1 this week (rolling upgrade, multi-servers).
We've noticed a change of behavior in...
32 Replies

39249 Views

Last post by 7224jobe
Tue Jan 27, 2026 2:51 pm
generateDomainPreAuthKey

Last post by zgokan « Tue Jan 27, 2026 2:21 am

by zgokan » Tue Jan 27, 2026 2:21 am

Hello

We want to perform tasks such as mailbox backup with Zimbra preauth without requiring a password. However, we are receiving the following...

0 Replies

2576 Views

Last post by zgokan
Tue Jan 27, 2026 2:21 am
Updated Anti-Spam Best Practices Blog Post

Last post by jered « Thu Jan 22, 2026 7:11 pm
Replies: 2
by L. Mark Stone » Wed Jan 21, 2026 6:13 pm

During 2025 we worked hard on improving our anti-spam best practices and today released an updated version of our blog post (originally written in...

2 Replies

2083 Views

Last post by jered
Thu Jan 22, 2026 7:11 pm
"View mail" with modern UI

Last post by 7224jobe « Wed Jan 21, 2026 11:01 am
Replies: 2
by 7224jobe » Fri Jan 09, 2026 4:35 pm

Hi everybody, if an user has modern UI as default web client, when I try to use View mail function from admin web interface I receive an error from...

2 Replies

2221 Views

Last post by 7224jobe
Wed Jan 21, 2026 11:01 am
Bug Report: Malformed Return-Path Concatenation in Zimbra MTA for Multi-Recipient Messages from Exchange Online

Last post by lovelord « Fri Jan 16, 2026 10:53 am

by lovelord » Fri Jan 16, 2026 10:53 am

Hi Administrators, BUGZILLA for Daffodil seems to be actually dead, I don't know if this is the right place to report this bug, but there's no other...

0 Replies

2943 Views

Last post by lovelord
Fri Jan 16, 2026 10:53 am

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