Seeing the same names in logcheck mails every hour / 2018-10-03

2018-10-03 Seeing the same names in logcheck mails every hour 2 years ago
I use the logcheck package to monitor for unexpected log entries. Since upgrading to the new homeserver conway I noticed DNSSEC failures coming back regularly, even at weird times of the night while the domain names seemed related to services we sometimes interact with during the day. To search deeper I enabled query logging on DNS (with a short retention period) in order to find the source.

Eventually I found it: the DNSSEC failures came at the time the mail from logcheck was delivered, because it mentioned domain names that cause a DNSSEC failure. So the way to 'fix' this problem and avoid similar other problems was to whitelist logcheck mail.

Update 2018-10-05: That only helps when enabling the Mail::SpamAssassin::Plugin::Shortcircuit plugin and enabling the USER_IN_WHITELIST shortcircuit.

Update 2018-10-07: Even with whitelist and shortcircuit I still see queries for domain names in the logcheck mails. Call to spamassassin is now changed...

Now, once again...this time with FEEwing

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