I'm getting a rejected email from a specific domain only, the rejection message is: "451 4.1.8 Possibly forged hostname for 64.132.162.194 (in reply to RCPT TO command)".
I have only one exchanged server 2010 and barracuda at front. I have setup sendconnectors that the smarthost point to barracuda as a smarthost, under sendconnector network properties.
Domain records are at Register.com. 64.132.162.194 resolves to barracuda.trendsinternational.com and reverse records also resolves to barracuda.trendsinternational.com.
Again, there is only one customer rejecting, our emails.
That will verify how your appliance is announcing itself to the world.
Simon.
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paco1969Author Commented:
Simon, thank you for your response. I have tried your suggestion and this is what I got back RCPT TO: helocheck@helocheck.abuseat.org
550 5.7.1 Unable to relay
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paco1969Author Commented:
Delivery has failed to these recipients or groups:
helocheck@helocheck.abuseat.org
A problem occurred during the delivery of this message to this e-mail address. Try sending this message again. If the problem continues, please contact your helpdesk.
and I got this from outlook: Generating server: barracuda.trendsinternational.com
helocheck@helocheck.abuseat.org
#< #5.0.0 X-Spam-&-Virus-Firewall; host helocheck.abuseat.org[54.245.112.115] said: 550 *** The HELO for IP address 64.132.162.194 was 'barracuda.trendsinternational.com' (valid syntax) *** (in reply to RCPT TO command)> #SMTP#
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The NDR is correct. If the host name is valid in the NDR and is what you expect then everything would appear to be correct - it has to be a false positive on the other side.
Simon.
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paco1969Author Commented:
Simon, an observation: when I check MX lookup for trendsinternational.com on MXToolBox I get: Pref Hostname IP Address TTL
0 exchange.trendsinternational.com 64.132.162.194 24 hrs
10 mail.trendsinternational.com 64.132.162.194 24 hrs
Also, I want to thank you very much for your assistance.
It would have to be a very picky site to reject on that basis. It would do no harm to replace the mail one with the actual host name and delete the 0 one completely.
Simon.
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paco1969Author Commented:
you mean replace it with the exchange host name or barracuda name?
Do the test as outlined here:
http://cbl.abuseat.org/helocheck.html
That will verify how your appliance is announcing itself to the world.
Simon.