Blacklist and Whitelist with Amavisd
Configure Blacklist and Whitelist with Amavisd in ZIMBRA instead of Postfix Blacklist/Whitelist. Configuration steps: 1. Edit /opt/zimbra/conf/amavis.conf.in and add the following…
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56 articles on this topic
How to block external email from domains or individual email
To configure ZIMBRA to reject external email addressed to users in the system, or blacklist email, follow these steps. 1. Configure smtpd_sender_restrictions as shown below.
How to change the recipient of the "daily report"
By default, ZIMBRA emails the system daily report to [email protected]. To send the daily report to a different email address, use the following procedure.
Configuring Whitelist/Blacklist on ZIMBRA 8.5/8.6
ZIMBRA 8.5 and later changed the configuration for blacklists and whitelists. To add whitelist/blacklist entries, follow these steps. Whitelist: create /opt/zimbra…
White list for ZIMBRA to bypass RBLs
If you use RBLs such as spamhaus.org on ZIMBRA to block spam, a customer's mail server may be blacklisted by the RBLs and unable to send to your system after being identified as potential spam.
Mail preview does not fill the screen in Zimbra Web Client 8.x and Google Chrome
A new Google Chrome version released on 2 September 2015 caused Zimbra Web Client 8.6, 8.5, and 8.0 to display the mail preview incorrectly, cutting it off instead of filling the screen.
How to fix "Error: Queue report unavailable – mail system is down"
If Zimbra cannot send or receive mail while webmail, POP, and IMAP work normally, check the log for "fatal: Queue report unavailable - mail system is down", as in the example zimbra@zm:~$
How to list members in distribution lists
A script to list users in every distribution list in the system, showing the results by distribution list, as in this example: ======= GROUP: dist1 ============= user1 ezy, [email protected]
How to resolves zmconfigd service can't start on ZIMBAR 8.5
If you install zimbra 8.5.0 on Centos 7 or Red Hat Enterprise 7 and zmconfigd fails to start, as in this example: [zimbra@ezymailhosting ~]$ zmcontrol status Host mail.amarz.ne
How to change HELO hostname
EHLO (or HELO) identifies a host at the start of an SMTP protocol connection. In zimbra, you can change the EHLO (or HELO) sent to other smtp servers and set the greeting banner.
How to find delivery performance of Zimbra Mail Server
You can check the performance of incoming and outgoing email on Zimbra mail by examining its delivery logs, allowing you to analyze system performance and identify which parts take particularly long…
Critical Security: Patch for OpenSSL Heartbleed Vulnerability
The OpenSSL Heartbleed bug (CVE-2014-0160) lets an attacker send a malformed heartbeat message and obtain data stored in the target machine's memory.
List of default ports used by Zimbra Mail Server
The network ports used by Zimbra mail server fall into two groups. 1. External Access - Ports accessed by Clients or services outside the Zimbra system.
How to fix error Table upgrade required. Please do "REPAIR TABLE" (2045019)
If you have upgraded Zimbra Collaboration Server (ZCS) to version 7 and encounter the error below: Table upgrade required. Please do "REPAIR TABLE" (2045019), from mysqlcheck, as in this example: D…
How to change default OS MTA to the ZCS Postfix
System email on a Zimbra server normally uses the system MTA. To send system mail using the Zimbra mailer instead of the default OS MTA, follow these steps. Backup default OS MTA [root@E
How to disable Zimbra's duplicate email detection
Zimbra detects duplicate messages to prevent multiple copies of the same email. This check is enabled by default and can be disabled for the server or individual accounts.
How to install SendmailAnalyzer on Zimbra mail
SendmailAnalyzer is a log analysis program that helps administrators examine an overview of incoming and outgoing email in graphs and reports, with hourly, daily, and monthly views.
How to share full account (all folders) to another user in Zimbra mail
Zimbra supports sharing a full account, or all folders, from one user to another. The recipient can read and edit the shared account's data as if it were their own.
How to fix SMTP authen fail with error "curl_easy_perform: error(56)"
When SMTP authentication fails in Zimbra for every user and program, check the error log at /var/log/zimbra.log for an error like this: Jul 28 16:34:05 server saslauthd[33294]:
How to install CentOS 6 for Zimbra Mail Server
Zimbra supports only a few Linux distributions. One of the supported distributions is the very popular CentOS 6. This article explains how to install CentOS 6.
Enable Zimbra Global Address List (GAL) to see all domains
Zimbra Autocomplete lists email addresses within a domain to help users enter addresses correctly and quickly. It can also be configured to list addresses across all domains.
Bypass spam checking for internal messages in Zimbra 8.x
Zimbra normally scans both internal email between local accounts and external email for spam. Sometimes internal messages are therefore marked as spam.
How to reset virus database on Zimbra
Zimbra uses ClamAV to scan email for viruses. Its virus database is normally updated regularly, but if updates fail, the database needs to be reset.
How to check MySQL password on Zimbra server
Zimbra uses a MySQL database to store operational data. Normally, when accessing mysql while logged in as zimbra, you do not need to enter a MySQL password. However, if you need to use MySQL…
How to fix "Service unavailable from cause of too many queries to uribl.com"
If Zimbra cannot receive email while sending works normally, check the log for a message like this: zimbramail postfix/smtpd[xxx]: NOQUEUE: reject: RCPT from mailx.ezylin
How to fix error: 97: Address family not supported by protocol on Zimbra
When starting the zimbra service, you may encounter the error message below: Starting nginx...nginx: [emerg] socket() [::]:7143 failed (97: Address family not supported by protocol) failed. Starting mta...Faile
How to check mailbox usage of all accounts in Zimbra mail server
A script for checking disk usage on a Zimbra mail server. This check mailbox usage script reports the space used by each user, the assigned Quota, and each user's status.
How to change HELO message in Zimbra Mail Server
To change SMTP HELO on a Zimbra server to match the configured MX record, follow the procedure below. Log in as the zimbra user. [root@EzyMailHosting ~]# su - zimbra Change the SMTP HELO setting...
How to delete emails from the Zimbra MTA queue
To remove large amounts of email stuck in the system queue after a spammer attack, follow these steps. To delete every email in the system queue, run: [root@EzyMailHosting ~]# /opt/zimb
Listing email, name, quota and status of all accounts on Zimbra
The script below lists names, email addresses, Mail Quota, and Account status grouped by domain, providing a quick overview from the command line. Example script output…
How to get a list of all distribution list members
Check the account names and email addresses in each distribution list (email) by copying the script below and running it as the zimbra user. #!/bin/sh echo > /tmp/groupslist.tx
How to monitor Zimbra services
Monitoring and checking Zimbra mail services is important for system administrators, who need to learn promptly when the system fails.
How to manual purging the Zimbra mailbox dumpster
To remove Dumpster data for a particular user from the system, run the following commands. Zimbra Collaboration Server 7.x.x zmmailbox -z -m [email protected] mbox [email protected]> emptyDumpster or zmsoap -z
How to enable Dumpster or Email Retention Policy
Since zimbra 7.0, a new feature called "Dumpster" has allowed users to recover email, calendars and contacts after they have been deleted from trash, helping them recover data quickly.
How to detect and prevent brute force attacks on Zimbra
Password policies in ZIMBRA can help prevent malicious users from guessing passwords through brute-force attacks, but this approach does not appear to resolve the problem completely.
How to set web server mode on Zimbra mail
To make webmail work over http, https, or both, change its operating mode using the steps below. Run the following command to change…
How to monitor messages statistics of Zimbra mail server
Zimbra provides monitoring that helps check system status and performance effectively, but it lacks monitoring of email sending and receiving statistics that would help administrators.
Backup incoming mail from zimbra system to another mail system
Edit /opt/zimbra/postfix/conf/mail.cf and add the following two lines. sender_bcc_maps = pcre:/opt/zimbra/postfix/conf/archive_mail recipient_bcc_maps = pcre:/opt/zimbra/postfix/conf/archive_mail
How to transfer the anti-spam database to another Zimbra server
When migrating zimbra to a new system or installing a new zimbra server, you can retain spam detection as effective as the previous system.
Improving Anti-spam on Zimbra with Whitelist/Blacklist
Email sent by users often ends up in the SPAM folder of recipients on the same Domain or system because the anti-spam system considers the message to resemble SPAM.
Zimbra users migration from 32-bit to 64-bit server
Migrating user data from 32-bit Zimbra to 64-bit Zimbra follows a process similar to normal backup and restore of user data in zimbra. Steps for moving user data from a 32-bit machine to a 64-bit machine.
How to backup and restore zimbra's users
The Zimbra mail server user backup and restore procedure in this article works with both the open source edition and network edition, but cannot be used for version upgrades. Zimbra uses LDAP to store user information…
How to expand membership of "Distribution List" in Zimbra
Zimbra provides distribution lists, or group email, for sending mail to groups, making it convenient to send to all or some recipients using a single email address. Its distribution lists have a limit.
How to check Zimbra version
There are several ways to check the Zimbra version: through a web browser, commands, or the installation history file. I have collected these methods for checking the Zimbra version…
How to create self-signed certificate for Zimbra mail server
Zimbra Collaboration Suite (ZCS), or Zimbra mail server, uses certificates to secure its operation and communication. If a certificate expires, Zimbra cannot operate, so a new certificate is needed.
How to calculate storage size for Zimbra mail server
Planning storage capacity is important: without estimating the total space required, the system may run out of storage. This article shows how to calculate the requirement.
How to check status, start and stop on Zimbra service
Use zmcontrol to check the operating status of Zimbra. It can also start and stop Zimbra. To use it, you must first log in as the zimbra user…
How to unlock Zimbra Accounts
Zimbra immediately locks an account after a configured number of failed login attempts to stop hackers repeatedly guessing passwords until they find the right one. If incorrect passwords reach the configured limit…
Guide for fix incoming mail from outside problems
When you have problems receiving email from outside, it can be difficult to determine where a message sent to your mail server has gone. First check the mail server logs, which can tell you…
Fix "zimbraRemoteManagementPrivateKeyPath (/opt/zimbra/.ssh/zimbra_identity) does not exist" on Zimbra Admin console
When using the Zimbra Admin console, clicking a menu to open its page may display an error window with this message: " server zimbra.mail.ezymailhosting.com zimbraRemoteManagementPrivateKey
How to create an admin account on Zimbra mail server
Creating an admin account and granting admin privileges to existing users on a Zimbra mail server. The command for creating an admin account is zmprov ca email password zimbraIsAdminAccount TRUE. An example follows.
Fix "Permission denied" issue when running zmsshkeygen command
If zmsshkeygen cannot generate a key because of a Permission denied error, as in this example: [zimbra@Ezymailhosting bin]$ ./zmsshkeygen Generating public/private dsa key pair. o
Zimbra JVM issue with OpenVZ
If you run Zimbra on OpenVZ, the zimbra service may fail to start with errors like these: Notification skipped. Starting servers...Could not create the Java virtual machine. Unable to deter
How to change the theme of all Zimbra clients
For Zimbra web client or Zimbra Desktop, an administrator can change the web interface theme so that all users must use the administrator's specified theme. Steps for changing the theme.
How to resolve "unable to determine enabled services from ldap"
After restarting the zimbra service or rebooting the server, you may encounter the following error when starting ldap: Starting ldap...Done. Unable to determine enabled services from ldap. Enabled services read f
Details of the Zimbra packages used during installation
Details of the Zimbra packages. Zimbra Core is the main package installed every time and contains libraries, utilities, monitoring tools, and basic configuration files. Zimbra LDAP provides user authentication.