While I like LWN and respect their writings, AND I appreciate and respect a good post-mortem story which involves some "I fucked up", this really just highlight

While I like LWN and respect their writings, AND I appreciate and respect a good post-mortem story which involves some "I fucked up", this really just highlights negligence on their sysadmin staff. And, in that respect, I don't they have any business telling other people to not run a mail server given their demonstrated negligence. Not everyone else is a fuck up, but LWN sure is. > configuration was introduced as part of a hurried email server replacement driven by the demise of CentOS 7 They knew for YEARS, and even after the Red Hat controversy of shitting down CentOS, they still sat on their butt and did nothing until the very last minute, and then f*ked it up. That's some serious negligence. Also, any competent self-hoster knows you need to run a recursive DNS resolver on-host to avoid these kinds of issues. Many other DNS-based RBL services already had such limits and those issues were extremely well-known. This is another sign of negligence. This guy is an idiot and should not be running a mail server. And, he/they have no business telling anyone else what to do.