There are postboxes on Uni Park in the Portland Building (just inside the lakeside main entrance) and near the West Entrance/FB Hall. I think there is one on Ilkeston Road nearish to SPC, though not sure if that's the closest one or not.
I need to post a few letters and wondered if anyone knew where the nearest post box is to either St Peter's Court or University Park?
There's one next to Subway on Derby Road if you're ever walking onto campus that way. Also there's one on Jubilee Campus next to the cash machines at the back of the Exchange Building (ie the side not by the lake).
The nearest one is actually on St Peter's Street, just a few minutes walk past the bus stop (towards Raleigh Park) on the opposite side of the road to St Peter's Court.