並前往https://www.1823.gov.hk/tc/faq/by-what-time-do-i-need-to-post-a-local-ordinary-mail-so-that-it-will-be-stamped-a-postmark-on-the-day-it-is-posted-when-is-the-cut-off-time-of-mailing-when-will-a-mail-item-reach-the-recipient