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Today I found this in our KConnect Security log :
[12/Jan/2016 10:17:13] Message from IP address, sender <apache<_at_>forum.kerio.com> temporarily rejected: sender domain does not resolve


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I see this on my server from time to time.

For security reasons Kerio Connect wants to resolve the IP address against a DNS record and (for a number of possible reasons) the DNS server that Kerio is using couldn't resolve it.

There's a whole lot of things it could be (including spam) but quite often I see this type of message when there's an auto reply setup on a user account. The auto reply will try to respond to "no reply" type addresses and the server name doesn't for that system doesn't exist in the public DNS register.

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