Today, the minimum size of a letter or card which PostNL will accept is 140 × 90 mm. However, in 1948 Anneke Dronkers announced that she was married in Pembroke, England using a much smaller envelope.
![](https://i0.wp.com/www.netpha.nl/wp-content/uploads/2021/02/Hillesum_Small_Cover_Fig1_1200px.jpg?resize=930%2C603&ssl=1)
Possibly due to post-war paper scarcity, this attractive card with accompanying envelope turned out to be very small. The envelope measures just 71 x 46 mm, about half of what is permitted today. Postage stamp and address barely fit on the front of the envelope!
![](https://i0.wp.com/www.netpha.nl/wp-content/uploads/2021/02/Hillesum_Small_Cover_Fig2_1200px.jpg?resize=930%2C719&ssl=1)
The minimum size of 14 × 9 cm was included in the PTT-Post General Terms and Conditions in 1993. Until 1 January 1994, a redundancy arrangement applied. The sender – as far as is known – received a card from PTT and the too small mail item was simply delivered.
![](https://i0.wp.com/www.netpha.nl/wp-content/uploads/2021/02/Hillesum_Small_Cover_Fig3_1200px.jpg?resize=930%2C665&ssl=1)