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Modify downstream_smtp_server_addr and downstream_smtp_server_port to specify the downstream or backend MTA server IP address or hostname and port.
Note
Note
To avoid security issues that arise from resolving the host, Trend Micro recommends using the IP address.
  • If downstream_smtp_server_addr and downstream_smtp_server_port are not specified, the default values are 127.0.0.1 and 10026, respectively.
  • downstream_smtp_server_addr supports IPv4 and IPv6 addresses in the following IP formats:
    127.0.0.1
    ::1
    123.123.123.123
    2001:db8:10ff::ae:44f2
    Domain.com
For example, if the downstream IP address is 2001:db8:10ff::ae:44f2 and the port is 25, use the following configuration:
downstream_smtp_server_addr=2001:db8:10ff::ae:44f2
downstream_smtp_server_port=25
Keywords: downstream