ZCS Multi-Server Installation Guide 8.0
ZCS Multi-Server Installation Guide 8.0
Network Edition

Preparing Your Server Environment > DNS Configuration Requirement

DNS Configuration Requirement
When you create a domain during the installation process, ZCS checks to see if you have an MX record correctly configured. If it is not, an error is displayed suggesting that the domain name have an MX record configured in DNS.
In order to send and receive email, the Zimbra MTA must be configured in DNS with both A and MX records. For sending mail, the MTA uses DNS to resolve hostnames and email-routing information. To receive mail the MX record must be configured correctly to route the message to the mail server.
You must configure a relay host if you do not enable DNS. After ZCS is installed, go to the Configure>Global Settings>MTA page on the administration console and uncheck Enable DNS lookups. Enter the relay MTA address to use for external delivery.
Even if a relay host is configured, an MX record is still required if the ZCS server is going to receive email from the Internet.
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