I think that if, in good faith, the person is unable to accept more CSAM due to the fact that their hard drive is full, there isn’t an issue. The intent of the law is that, it someone knows something is CSAM, they need to report it. I don’t think the government is going to come hard on Lemmy server owners unwittingly receiving CSAM through federation (though they certainly would want them to report and take down the CSAM on their servers)
Be careful with this though. I think I remember some jurisdictions require server owners not to delete CSAM and report it instead. Verify that you aren’t obligated to keep it before deleting it
Apple just claimed an exception. It’s still up to the EU to determine whether it is actually exempt or not.
Do you have any DNS server on port 53? If so, could you check which process or application it is?
I’m not sure but this might have to do with systemd-resolved. You may want to disable it, that might fix your problem
https://social.overheid.nl/about is the official Dutch government mastodon server