u/Aweq

Liefe and cher(e)s Belgians,

I am going to visit Antwerp in a couple of days and being a bit oldschool I like to send out postcards.

Whilst trying to figure out whether I could buy stamp codes online I got confused by BPost: https://www.bpost.be/nl/brief-verzenden/hoeveel-postzegels

Standard sized letters seem To be defined as either

A4 folded in 3 (210 x 99 mm)

A4 folded In 4 (148 x 99 mm)

or (what would make sense)

Maximale dikte: 5 mm
Minimale afmetingen: 90 x 140 mm
Maximale afmetingen: 125 x 235 mm

Can I just send a card using standard stamps with dimensions within min and max or do I need to measure for those weird folded A4 option? merci and bedankt