7023320: 450 Host Down When Using Hostname for “Relay Host for Outbound Messages”

This document (7023320) is provided subject to the disclaimer at the end of this document.


GroupWise 18
GroupWise 2014 R2
GroupWise 2012
GroupWise 8


When setting up the GroupWise Internet Agent (GWIA) and populating the setting “Relay Host for Outbound Messages” with a hostname instead of an IP address — 450 Host Down can occur in a couple of situations.


In most instances, the likely cause is simply the inability of a GWIA to communicate directly with Relay Host (whether it is by using an IP address or hostname). This can be tested simply by creating a telnet connection from the GWIA to the mail relay.
To accomplish this open a terminal screen on the GWIA server on Linux or a Command Prompt on a Windows Server if GWIA is in the Windows environment and type in the following command:
telnet <relay hostname> 25 (Linux)
telnet <relay hostname>:25 (Windows)
telnet <IP address of relay> 25 (Linux)
telnet <IP address of relay>:25 (Windows)
If no connection information is returned for any of the options, then there likely is a router/firewall issue. If the connection works for the IP address but not the hostname, there is likely a problem with the “A” record of the relay server in DNS or DNS is not setup properly on the server itself.
Another possibility might be that a MX record was inadvertently assigned directly to the hostname. For instance: if the relay hostname is relay.mailserver.com and an MX record was assigned to that hostname directing it elsewhere, GWIA will use that entry first before testing it as an A record. The MX record should be assigned to the domain name “mailserver.com” which will point to the A record of “relay.mailserver.com”.


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