systemd-resolved
From https://www.freedesktop.org/software/systemd/man/systemd-resolved.service.html: systemd-resolved is a system service that provides network name resolution to local applications. It implements a caching and validating DNS/DNSSEC stub resolver, as…
SPF records, you’re doing them wrong
SPF, or Sender Policy Framework, is a DNS-based technique aimed at stopping sender address forgery on emails. If you're using ~all in yours and you're not actively in the process of migrating over to using SPF, you're doing it wrong. (Yes, Google, Ap…