Global Settings controls global rules that apply to accounts in the Zimbra servers. The global settings are set during installation, and the settings can be modified from the administration console. A series of tabs make it easy to manage these settings.
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Default domain. The default domain displays. This is the domain that user logins are authenticated against.
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Number of scheduled tasks that can run simultaneously. This controls how many threads are used to process fetching content from remote data sources. The default is 20. If this is set too low, users do not get their mail from external sources pulled down often enough. If the thread is set too high, the server may be consumed with downloading this mail and not servicing “main” user requests.
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The Attachments tab can be configured with global rules for handling attachments to an email message. You can also set rules by COS and for individual accounts. When attachment settings are configured in Global Settings, the global rule takes precedence over COS and Account settings.
You can also reject messages with certain types of files attached. You select which file types are unauthorized from the
Common extensions list. You can also add other extension types to the list. Messages with those type of files attached are rejected. By default the recipient and the sender are notified that the message was blocked. If you do not want to send a notification to the recipient when messages are blocked, you can disable this option from the Global Settings>Attachments tab.
The MTA tab is used to enable or disable authentication and configure a relay hostname, the maximum message size, enable DNS lookup, protocol checks, and DNS checks. For a information about the Zimbra MTA, see
Zimbra MTA.
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Authentication should be enabled, to support mobile SMTP authentication users so that their email client can talk to the Zimbra MTA.
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TLS authentication only forces all SMTP auth to use Transaction Level Security to avoid passing passwords in the clear.
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The Relay MTA for external delivery is the relay host name. This is the Zimbra MTA to which Postfix relays non-local email.
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If your MX records point to a spam-relay or any other external non-Zimbra server, enter the name of that server in the Inbound SMTP host name field. This check compares the domain MX setting against the zimbraInboundSmtpHostname setting, if set. If this attribute is not set, the domain MX setting is checked against zimbraSmtpHostname.
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If Enable DNS lookups is checked, the Zimbra MTA makes an explicit DNS query for the MX record of the recipient domain. If this option is disabled, set a relay host in the Relay MTA for external delivery.
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If Allow domain administrators to check MX records from Admin Console is checked, domain administrators can check the MX records for their domain.
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Set the Maximum messages size for a message and it’s attachments that can be sent. Note: To set the maximum size of an uploaded file to Documents or Briefcase, go to the General Information tab.
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You can enable the X-Originating-IP header to messages checkbox. The X-Originating-IP header information specifies the original sending IP of the email message the server is forwarding.
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The Protocol fields are checked to reject unsolicited commercial email (UCE), for spam control.
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The DNS fields are checked to reject mail if the client’s IP address is unknown, the hostname in the greeting is unknown, or if the sender’s domain is unknown.
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With POP3 users can retrieve their mail stored on the Zimbra server and download new mail to their computer. The user’s POP configuration determines if messages are deleted from the Zimbra server.
ZCS utilizes SpamAssassin to control spam. SpamAssassin uses predefined rules as well as a Bayes database to score messages with a numerical range. ZCS uses a percentage value to determine spaminess based on a SpamAssassin score of 20 as 100%. Any message tagged between 33%-75% is considered spam and delivered to the user’s Junk folder. Messages tagged above 75% are always considered spam and discarded.
When a message is tagged as spam, the message is delivered to the recipient’s Junk folder. Users can view the number of unread messages that are in their Junk folder and can open the Junk folder to review the messages marked as spam. If you have the anti-spam training filters enabled, when they add or remove messages in the Junk folder, their action helps train the spam filter. See
Anti-Spam Protection.
Anti-virus protection is enabled for each server when the Zimbra software is installed. The global settings for the anti-virus protection is configured with these options enabled:
During ZCS installation, the administrator notification address for anti-virus alerts is configured. The default is to set up the admin account to receive the notification. When a virus has been found, a notification is automatically sent to that address.
When ZCS is deployed in a mix of ZCS servers and third party email servers and Calendar is an important feature with your users, you can set up free/busy scheduling across the mix so that users can efficiently schedule meetings.
ZCS can query the free/busy schedules of users on Microsoft Exchange 2003/2007 servers and also can propagate the free/busy schedules of ZCS users to the Exchange servers.
To set free/busy interoperability, the Exchange systems must be set up as described in the Exchange Setup Requirements section, and the ZCS Global Config, Domain, COS and Account settings must be configured. The easiest way to configure ZCS is from the administration console.
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Add the o and ou values that are configured in the legacyExchangeDN attribute for Exchange in either the Global Config or Domain Interop tab or in the Class of Service (COS) Advanced tab. The o and ou values correspond to the ZCS domain attribute zimbraFreebusyExchangeUserOrg.
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The ZCS Global Config Settings are configured from the Interop tab on the administration console. Here you configure the Exchange server settings as follows:
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The O and OU used in the legacyExchangeDN attribute. Set at the global level this applies to all accounts talking to Exchange.
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During ZCS install, by default, backups are scheduled to run daily. The target backup directory and the email notification address to receive backup session results are set up during ZCS installation. You can change the backup method and schedule from the administration console.
In Global Settings, you can change the logo and base colors of the Zimbra Web Client themes (skin) from the administration console without having to customize individual ZCS themes. This also changes the base colors for the administration console. Read the
Changing ZWC Theme Colors and Logo chapter to understand what you can change and what attributes are modified.
To manage your disk utilization, implement a global HSM policy or a HSM policy for each mailbox server. The policy configured on individual servers overrides the policy configured as the global policy.
Email messages, documents stored in Documents or Briefcase, and the other items in the account are moved from the primary volume to the current secondary volume based on the HSM policy. The items are still accessible. Users are not aware of any change and do not see any noticeable differences when opening older items that have been moved.
The default global HSM policy is to move messages and document files more than 30 days old to the secondary volume. You can also select to move tasks, appointments, contacts chats, notes. The schedule for moving can be set for items older than a specified number days, months, weeks, hours, minutes.
Sessions to move items to the secondary volume are scheduled in your cron table. You can manually start an HSM session from the Servers, Edit toolbar.
A Zimbra license is required in order to create accounts. When you purchase, renew, or change the Zimbra license, you must update the Zimbra server with the new license information. The
Update License Wizard from the administration console’s Global Settings is used to upload and install a new license and to update an existing license, or you can install or update the license using the
zmlicense CLI command. See Appendix A, CLI Commands,
zmlicense to use the CLI command.
Current license information, including the license ID, the issue date, expiration date, number of accounts purchased, and the number of accounts used can be viewed from the Global Settings License tab.
When the number of accounts created is equal to the number of accounts purchased you will not be able to create new accounts. You can purchase additional accounts or you can delete existing accounts. Contact Zimbra sales to purchase additional accounts.
You must renew your license within 30 days of the expiration date. Starting 30 days before the license expires, when you log on to the administration console, a reminder notice is displayed.
When you renew or change the Zimbra license, you update ZCS mailbox servers with the new license information. This can be done from either the administration console or using the
zmlicense CLI command.
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Click Install to install the license file.
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Note: This step is not necessary if there is only one mailbox server in your environment.
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