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I have recently discovered the following error messages appearing together in my spam filter logs:
When this occurs, the antispam check is skipped - there is not "ctasd results" message -- so the message will be allowed unless a static rule causes it to be blocked anyway.
It does not happen very often but it has happened on enough days during the last 2 months to get me worried.
I have a case open with support, but of course Level 1 has no idea what it means. I expect to have trouble with escalation because I am running version 9.506-2, which I consider the "most recent stable release".
So I am asking others in this forum to search their spam logs, see if they are also seeing this message. Then please open a support case and summarize your findings here.
Interesting, Doug. An example came from 22.214.171.124 (Chile) on 6-10. There's no rDNS for that IP, but the message was delivered to the server instead of being rejected or quarantined.
Starting a case now.
Cheers - Bob
In reply to BAlfson:
UTM is my secondary spam filter, so all messages come from the same internal source. No reason to expect source sensitivity.
In reply to DouglasFoster:
It's just that both 'Reject invalid HELO / missing RDNS' and 'Do strict RDNS checks' are selected in this UTM.
Support said that this indicates a network communication failure, which I have concluded is consistent with the times when the problem was reported.