ZCS Administrator's Guide 8.0.4
ZCS Administrator's Guide 8.0.4
Open Source Edition


Managing Configuration > Global Configuration

Global Configuration
Global Settings apply to all accounts in the Zimbra servers. They are initially set during installation. You can modify the settings from the administration console.
Configurations set in Global Settings define inherited default values for the following objects: server, account, COS, and domain. If these attributes are set in the server, the server settings override the global settings.
To configure global settings, go to the administration console Configure > Global Settings page.
Configured global settings include:
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General Global Settings
The General Information page includes the following settings.
 
Option 
Description 
The maximum size of a file that can be uploaded into Briefcase. Note: the maximum message size for an email message and attachments that can be sent is configured in the Global Settings MTA page
Admin help URL and Delegated admin help URL
Setting Up Email Attachment Rules
Global email attachment settings allow you to specify 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.
The following attachment setting options can be configured from the Global Settings Advanced page. To set by COS or account, go to their Advanced page, Attachment Settings section.
 
Option 
Description 
Blocking Email Attachments by File Type
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 page.
Global MTA Settings
The Global Settings>MTA page is used to enable or disable authentication and configure a relay hostname, the maximum message size, enable DNS lookup, protocol checks, and DNS checks.
 
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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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Web mail MTA Host name and Web mail MTA Port. The MTA that the web server connects to for sending mail. The default port number is 25.
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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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If Enable Milter Server is checked, the milter enforces the rules that are set up for who can send email to a distribution list.
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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 Briefcase, go to the General Information page.
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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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Customize zimbraMtaRestriction (restrictions to reject some suspect SMTP clients).
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Global IMAP and POP Settings
IMAP and POP access can be enabled as a global setting on the Global Settings>IMAP or POP pages or by editing a server’s IMAP or POP pages.
When you make changes to the IMAP or POP settings, you must restart before the changes take effect.
IMAP and POP3 polling intervals can be set from the administration console COS Advanced page. The default is to not set the polling interval.
Note:
With POP3, users can retrieve their mail stored on the Zimbra server and download new mail to their computer. The user’s POP configuration in their Preference>Mail page determines how their messages are downloaded and saved.
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