550 host unknown *.af.mil

  • 7018828
  • 25-Apr-2017
  • 31-Jan-2018

Environment

Novell GroupWise 2014 R2 Support Pack 1 Hot Patch 2
Novell GroupWise 2014 R2 Support Pack 2

Situation

When trying to send to an *af.mil domain, there is a large amount of MX records that it seems to go through and never gets delivered.  Instead the sender gets a 550 Host Unknown returned by the GWIA

Resolution

A work around for getting email to an us.af.mil emailserver can be set by adding an entry in the local hosts files on our GWIAs that points to us.af.mil to an IP address on one of their email servers.  

Only one IP address per host name can be added in a local hosts file so as long as the one email server is up they can send email to us.af.mil email addresses.

This has been fixed in GroupWise 2014 R2 build 128599 or newer.  The fix is also in GroupWise 18

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