Use with redundant internal and external MTAs (Mail Transport Agent)
In the SEPPmail Secure E-Mail Gateway configuration, both as external MTA (email relay) (see Mail System Outgoing server Server name) as well as per internal email domain (email server) (see Mail System Managed domain Settings Forwarding server), only one host can be indicated each. If several systems are to be addressed, this must be done via DNS MX records.
If no DNS server which provides MX records for the servers to be connected is available locally, local (pseudo) records can be defined and used in the menu System under Advanced view DNS add local zone.
Figure 9 - Schematic representation for the use of redundant internal and external MTAs
