どんなことがあろうとも、郵便は配達されるだろう。

what; what kind of; (with -temo, demo, etc.) any(body, thing, means, etc.)

thing; matter; incident; occurrence; event; something serious; trouble; crisis; circumstances; situation; state of affairs; work; business; affair; after an inflectable word, creates a noun phrase indicating something the speaker does not feel close to; nominalizing suffix; pretending to ...; playing make-believe ...; alias; aka; nickname; alternative name; also known as

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

to be (usu. of inanimate objects); to exist; to live; to have; to be located; to be equipped with; to happen; to come about

certainly; of course; to be sure; surely; even if; no matter (who, what, when, where, why, how); though; although; without even; without so much as; at the (least, earliest, etc.); also (called); emphatic particle

mail service; postal service; mail; post; mail; postal matter; postal items

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

delivery; distribution

be; is; indicates past or completed action; indicates light imperative