420 TCP write error

hi Experts,

Groupwise GWIA version: 6.5.7
Platform: Netware 5.1

Received non-deliverable error for outbound email to partner's internet domain...Other internet domains were ok. Inbound email from partner's internet domain were ok.

Transcript of session follows:
        Command:  Data...
        Response: 420 TCP write error

I have done a search on google and read thru the following links. Done a spamhaus check to ascertain that our outbound smtp public ip was not blacklisted.  
http://support.novell.com/docs/Tids/Solutions/10060050.html
http://support.novell.com/docs/Tids/Solutions/10080200.html

Done a telnet to partner's internet domain and returned a  "Connect failed" (presumably they have blocked any incoming telnet to their SMTP gateway)

Please advise further troubleshooting steps to identify cause of non-deliverable emails to only certain internet domains.









kenny_klbnAsked:
Who is Participating?
 
deroodeConnect With a Mentor Systems AdministratorCommented:
C:\TEMP>nslookup -query=mx stellatravel.co.uk
Server:  mailgate.eur.nl
Address:  130.115.1.1

Non-authoritative answer:
stellatravel.co.uk      MX preference = 10, mail exchanger = relay1.netnames.net
stellatravel.co.uk      MX preference = 100, mail exchanger = relay2.netnames.net
stellatravel.co.uk      MX preference = 1, mail exchanger = mail.stellatravel.co.uk

C:\TEMP>telnet mail.stellatravel.co.uk 25

220 mail.stellatravel.co.uk Microsoft ESMTP MAIL Service ready at Thu, 8 Sep 2011 08:42:18 +0100

Are you sure you connected to the smtp port?
Please follow the instructions in the previous link...
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deroodeSystems AdministratorCommented:
Does all mail to that domain fail?

Can you try telnetting to the SMTP port of the partner's SMTP server? See the following article about troubleshooting SMTP using Telnet.

http://www.anta.net/misc/telnet-troubleshooting/smtp.shtml

If you can deliver mail by using Telnet then you have a Groupwise problem. If delivery fails anyway there is something different going on...

You can use Telnet from your Netware server with the following telnet client:

http://www.novell.com/coolsolutions/tools/13775.html
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kenny_klbnAuthor Commented:
hi deroode,

Does all mail to that domain fail?
Yes, all mail to that domain failed.

internet domain concerned is stellatravel.co.uk
telnet result to smtp server ie mail.stellatravel.co.uk is "Connect failed"
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