GWIA or DNS problem?: 450 Host Down error on outgoing mail

I have a GroupWise server that is receiving mail properly but attempts to send produce the following error in the GWIA log (addressee is a mailbox at TTPSpecialProjects.com):

    DMN: MSG 1721 Send Failure: 450 Host down (TTPSpecialProjects.com)

- I have verified the BdrMgr filter exceptions against the Novell TID10013822
- I can initiate a telnet session from outside into Post 25
- I can initiate a telnet session from the GW server to port 25 on an outside server.
- I can use a domain name for the outgoing telnet session so the dns appears to be resolving.
- Contents of route.cfg: myorg.com [192.168.10.91]  
   (where "myorg" is the org's domain and the IP is the GW server internal IP)
- Contents of resolve.cfg:
                   domain myorg.com
                   nameserver 12.127.17.83
                   nameserver 12.127.16.83

System is NW6/GW6.5.  GW, BdrMgr, DNS/DHCP all run on one file server.

I am looking for ideas on the possible cause and tests I can run to rule out possible causes.

Thanks.
ttheimerAsked:
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billmercerConnect With a Mentor Commented:
>I have a GroupWise server that is receiving mail properly but attempts to send produce the following error in
>the GWIA log (addressee is a mailbox at TTPSpecialProjects.com)

From what you describe, it sounds like a problem with the TTPSpecialProjects.com server.
TTPSpecialProjects.com's MX record shows mail.ttpspecialprojects.com, which in turn resolves to 66.235.192.206.
I cannot connect to this machine on port 25, so the fact that you get a 450 error here doesn't mean much.

Are there other addresses you're having problems with besides this one?






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ttheimerAuthor Commented:
More information: The successful outgoing telnet test mentioned above was to a mail server at a hosting service.  I guess I just had a lucky guess because when I tried several other mail servers this morning they all failed - but telneting to the one still works.

So I decided to try an out going mail message to an account on the mail server to which I successfully telneted.  This one message transferred properly.

I know more but not enough to know what to try next based on this information.
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ttheimerAuthor Commented:
Problem resolved: The local DNS server was still forwarding to the name servers of the previous ISP.  I don't know why they weren't resolving to the proper IP addresses but it appears that they weren't.  After entering the correct DNS addresses we needed to wait to the end of the business day to bounce the server.  Once it was restarted the GW server was both receiving and sending properly.

billmercer - I'm not sure why you didn't get a response from 66.235.192.206?  This is my mail service at an ISP and when I tried this evening I get a response on both ports 25 and 110.
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billmercerCommented:
For what it's worth, if you solved the problem yourself, the correct thing to do would be to request the question be PAQed, rather than giving me a lousy grade which makes me look bad.
  http://www.experts-exchange.com/help.jsp#hi73 


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ttheimerAuthor Commented:
billmercer - thanks for the note about grading.  The FAQ link that you gave shed new light on how the grading is intended to be used.

And I looked up PAQ to understand how that is used for self-answered questions.  I didn't find how to make a question PAQ'd but I'll keep looking.

Thanks for the guidance.
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billmercerCommented:
To do this, post a message in the SUPPORT area of EE, asking that the question be PAQed. A moderator will take care of it for you.

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