Configuring Global Settings MTA

The following global MTA settings can be configured.

  1. Go to Configure>Global Settings.

  2. Click MTA in the Navigation pane.

  3. Modify the following options

Option

Description

Authentication

  • Authentication should be enabled, to support mobile SMTP authentication users so that their email client can talk to the Zimbra MTA.

  • TLS authentication only forces all SMTP auth to use Transaction Level Security (similar to SSL) to avoid passing passwords in the clear.

Network

  • 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.

  • Relay MTA for external delivery. (e.g., the ISP requires that all mail originating from your network be relayed through their MTA) to which the Zimbra Postfix relays non-local email. See Relay MTA for external delivery.

  • 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.

Milter Server

  • If Enable Milter Server is checked, the milter enforces the rules that are set p for who can send email to a distribution list.

Archiving Configuration

  • Enable archiving.  Changes of settings requires MTA restart in order to take effect.

Messages

  • Set the maximum messages size for a message and  its attachments that can be received. Note: To set the maximum size for files uploaded to Briefcase, go to the Global Settings>General Information page.

  • This is enabled by default. Every email sent directly from the server includes the X-Originating-IP in the message header. This specifies the original sending IP of the email message the server is forwarding.

Policy Service Checks

  • Policy Service

Protocol checks

  • To reject unsolicited commercial email (UCE), for spam control.

DNS checks

  • 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.

  • Add other email recipient restrictions to the List of RBLs text box.

 

 

  1. Click Save.

 

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