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I'm getting the following message on my Kerio Security log:
[23/Apr/2008 10:33:28] Message from IP address, sender <noreply<_a.t_>> rejected: sender domain does not exist

How is kerio performing this check - is it a simple nslookup on or more complex MX record lookups?

Kind regards

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Have you created a PTR record with your ISP pointing to the public IP of your email server?

Sounds to me like the receiving mailserver is doing a reverse DNS check on your mailserver and is not getting the same address as your mailserver is advertising on - therefore rejecting the mail.

This normaly happens when your dns is hosted by someone other than your ISP. When it does a DNS check on your mailservers IP address it will get something like rather than your mailserver domain - the way to solve this is to ask your ISP to create a ptr record for your mailserver domain.


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Hi Kevin

I don't think Graham gave you the right answer to your question. Your question was about receiving mail with KMS. KMS checks for the MX record of the senders e-mail address. It does not check PTR or so. So needs at least one MX record. That's all.

This is a simple check to avoid spam. You can also switch that feature off in KMS.

Dexion AG - The Blackberry Specialists in Switzerland
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