MTA Configuration defines Jatheon cCore ability to receive emails from Journaling server.
You can access the MTA configuration from: 

1. Appliance console: login as: fido, pass: jatheonpnc 
2. php configuration console available at FQDN/IP:8080 user: ergo, pass: jatheonergo

Explanation of configurable fields: 

Origin

Sample Value: cCore.internal.jatheon.com
Explanation:
Defines the domain name used as the origin of outbound email when the full address is not specified.
How to configure:
Set this to the Jatheon cCore fully qualified domain name (FQDN). Should match your internal DNS and hostname.

Hostname

Sample Value: cCore6.internal.jatheon.com
Explanation:
This sets the hostname of the mail server.
How to configure:
Use the Jatheon cCore FQDN. Must resolve via DNS and match hostname -f output.

Destination

Sample Value: cCore.internal.jatheon.com, localhost
Explanation:
List of domains that this mail server considers "local". Emails to these domains are delivered locally.
How to configure:
Include the Jatheon cCore FQDN and localhost. Add any domains for which the server receives mail directly.

Networks

Sample Value: 192.168.1.0/24 127.0.0.0/8 
Explanation:
List of trusted networks allowed to relay mail through this server.
How to configure:

• Include your internal subnet (e.g., 192.168.1.0/24)
• Loopback (127.0.0.0/8) 
  
  

MTA Banner (Optional)

Value: $myhostname ESMTP $mail_name (Debian/GNU)
Explanation:
The banner displayed when someone connects to the SMTP port (25).
How to configure:
Use the default or customize for security by removing detailed version info (optional).

Message size limit

Value: 102400000
Explanation:
Maximum size (in bytes) for an email.
How to configure:
This example is approx. 102MB. Adjust as per policy. For example, 50MB = 52428800.

Error Notice Recipient (Preconfigured)

Value: postmaster
Explanation:
Address to which Postfix sends error notifications.
How to configure:
Use postmaster or a specific admin email alias like admin@yourdomain.com.

Journalmaster of relay agent (Optional - leave blank) 

Explanation:
Used in archiving/journaling systems. Identifies the journaling agent (e.g., Exchange journal target).
How to configure:
Leave blank unless required by your journaling setup. Sometimes same as postmaster.

Mail Relay Host

Sample Value: ruby.internal.jatheon.com
Explanation:
Relay host (smart host) to which all outbound mail is forwarded.
How to configure:
Set to the hostname or IP of the upstream relay (e.g., anti-spam gateway, archiving appliance, or ISP relay). Should resolve via DNS