Zimbra Collaboration Suite 7.0
Zimbra Collaboration Suite 7.0
Administrator's Guide
Open Source Edition


Managing ZCS Configuration > Global MTA Settings

Global MTA Settings
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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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 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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