Half of all post boxes are to be emptied just once a day as the Royal Mail seeks to cut costs. ... The new single collection time for the reduced-service post boxes is likely to be at any time between 9am and 3pm each day, depending on how far along a postie's round they are.

How do mail drop boxes work?

Letters are dropped for collection through the chute into a box on the ground floor. A slot or opening where customers deposit mail. A new form of collection receptacle that the Postal Service™ has installed to better assist business/volume mailer with their shipping needs using prepaid postage.

Is it safe to leave mail in your mailbox?

"Those are designed to be a very secure method of receiving that collections mail," Adam Sale, USPS inspector, said. Even as safe as they are, they too, just like neighborhood mailboxes, can sometimes become the target of thieves. Which is why the USPS never recommends leaving things in mailboxes overnight.