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Well, "valid," yes, but "deliverable" thankfully, no $ dig MX example.com. ;; ANSWER SECTION: example.com. 3600 IN MX 0 . Almost certainly the same fo
by mdaniel 1y ago
Well, "valid," yes, but "deliverable" thankfully, no
$ dig MX example.com.
;; ANSWER SECTION:
example.com. 3600 IN MX 0 .
Almost certainly the same for its .org .net and .example friends. There were some other TLDs that were designed for use in documentation, but I don't have the RFC in front of me right now to cite them
- SoftTalker 1y agoSome of the other examples which are "technically valid but obsolete" I would consider safe to call invalid for practical purposes.
- samwho 1y agoYeah, I almost put a disclaimer at the end saying that while these examples are valid according to the spec, that has no bearing on whether they’re usable in practice. Email is the Wild West.