We're sorry that your letter with a priority stamp was not delivered on time. Your priority letter will be delivered the next day in Belgium in 95% of the cases if:Your priority letter is placed in a red mailbox before the last collection of the day. The collection time is listed on the mailbox.Your priority letter is handed in at a Post Office or Post Point before the last collection. The collection time is listed in every Post Office and Post Point.Only in exceptional cases will your priority letter not be delivered on time (e.g. a technical malfunction). As a regulator of the postal market, BIPT sees to it that at least 95% of the letters with a priority stamp are delivered within Belgium the next workday.