Write it once, and give it a URL that never moves.

Structured blocks — headline, dateline, body, boilerplate, contact — with assisted drafting available at each. Pasting from a word processor is safe: everything is translated through a whitelist that emits only from an allowed set of elements, which is also what stops a prompt-injected script surviving into an email.

As a hard gate, not a convention. An embargoed release is indistinguishable from one that does not exist at its public URL until the time passes, and preflight blocks a send that would break one. An embargo outranks everything, including an operator pressing send.

It gets a slug minted once and never silently changed, and a public page that anyone — journalist, reader, crawler — can reach. Draft and embargoed releases return a genuine 404 rather than a placeholder, because a placeholder is a page that can be indexed.