already publishing anti-functional MX records
I only publish a handful of anti-functional MX records, for a few
domains that get a buttload of spam due to having appeared in usenet
message IDs that were mis-scraped onto spam lists a long time ago.
I probably have two orders of magnitude more A records than MX records,
and I'm not inclined to add an MX . and SPF -all for all of them.
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