Quality Inspector applicants have rated the interview process at US Postal Service with 2 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 67% positive. This is according to Glassdoor user ratings.
Here are the most commonly searched roles for interview reports -
Fair and balanced with job relevant questions in the area they want people to contribute. This might be a position to pursue if you do not mind the physical demands of the job that requires you to lift and shift loads of mail from one bin to another