The following MTA settings for servers can be changed. The server settings override the global settings.
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Enable authentication |
Enables SMTP client authentication, so users can authenticate. Only authenticated users or users from trusted networks are allowed to relay mail.
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TLS authentication only |
When checked, forces all SMTP auth to use Transaction Level Security (similar to SSL) to avoid passing passwords in the clear.
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Web mail MTA Hostname |
The MTA that the web server connects to for sending mail.
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Web mail MTA port |
The default is port 25. This cannot be changed from the administration console.
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Web mail MTA timeout (s) |
This setting determines how long the MTA will try to connect to the server.
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Relay MTA for external delivery |
Enter the relay host name. This is the Zimbra MTA to Gateway host.
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Enable DNS lookups |
The Zimbra MTA makes an explicit DNS query for the MX record of the recipient domain. The default is enabled. If this option is disabled, set a relay host in the Relay MTA for external delivery field.
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