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Possibly forged hostname
Posted on 2013-11-07
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.trendsinternatio
Again, there is only one customer rejecting, our emails.
thank you very much!
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.trendsinternatio
Again, there is only one customer rejecting, our emails.
thank you very much!
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12 Comments
Active 6 days ago
If there is a problem, it is with the appliance, as that is what the external server will see.
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.
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.
Simon, thank you for your response. I have tried your suggestion and this is what I got back RCPT TO: helocheck@helocheck.abusea
550 5.7.1 Unable to relay
550 5.7.1 Unable to relay
Delivery has failed to these recipients or groups:
helocheck@helocheck.abusea
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.trendsinternatio
helocheck@helocheck.abusea
#< #5.0.0 X-Spam-&-Virus-Firewall; host helocheck.abuseat.org[54.2
helocheck@helocheck.abusea
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.trendsinternatio
helocheck@helocheck.abusea
#< #5.0.0 X-Spam-&-Virus-Firewall; host helocheck.abuseat.org[54.2
Active 6 days ago
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.
Simon.
Simon, an observation: when I check MX lookup for trendsinternational.com on MXToolBox I get: Pref Hostname IP Address TTL
0 exchange.trendsinternation
10 mail.trendsinternational.c
Also, I want to thank you very much for your assistance.
0 exchange.trendsinternation
10 mail.trendsinternational.c
Also, I want to thank you very much for your assistance.
Active 6 days ago
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.
Simon.
Active 6 days ago
The appliance, because that is what the internet sees. Exchange is behind the appliance, but the internet doesn't care.
Simon.
Simon.
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