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


Zimbra MTA > Receiving and Sending Mail through Zimbra MTA

Receiving and Sending Mail through Zimbra MTA
The Zimbra MTA delivers both the incoming and the outgoing mail messages. For outgoing mail, the Zimbra MTA determines the destination of the recipient address. If the destination host is local, the message is passed to the Zimbra server for delivery. If the destination host is a remote mail server, the Zimbra MTA must establish a communication method to transfer the message to the remote host. For incoming messages, the MTA must be able to accept connection requests from remote mail servers and receive messages for the local users.
In order to send and receive email, the Zimbra MTA must be configured in DNS with both an A record and a MX Record. For sending mail, the MTA use DNS to resolve hostnames and email-routing information. To receive mail, the MX record must be configured correctly to route messages to the mail server.
You must configure a relay host if you do not enable DNS. Even if a relay host is configured, an MX record is still required if the server is going to receive email from the internet.