The postal history hall shows the evolution of communication by post in Spain through various exhibition areas.
The correspondence acceptance area begins with the sender depositing the letter in a post-box or brings it to a Correos office, where it is subsequently weighed to determine its postage.
Of great historical value are forty post-boxes from throughout Spain. Among the most significant of them are: the marble lion's-head post-box that was at the Royal Post-Horse Relay House from 1877 to 1919, an iron pillar box from the mid 19th century and various models of pillar boxes dating from the 1940s to the present.
As regards letter scales, visitors may observe a bronze-plated scale with a set of weights from Cañete la Real (Malaga) and various models of automatic letter scales, as well as scales from the 80s for calculating postage rates and franking machines that could stamp up to 15,000 envelopes an hour.
This area features a selection of postmarks from various Spanish provinces, cancellation machine rollers with the date of the enactment of the Spanish constitution (1978) and a postal machinery exhibit with manual and automatic cancellation machines for postmarking correspondence.
Next is the letter-transport area. The postal service has used various modes of transport throughout history: stagecoach, bicycle, motorcycle, rail, automobile, ship and aeroplane.
Of particular note among the museum pieces in this area are: a model of the Igualadina stagecoach, which was used to deliver the post between Barcelona and Igualada from 1828 until the inauguration of the Barcelona-Zaragoza railway in 1865. From that point forward, the Igualadina stagecoach ended its journey in Martorell. A bicycle with a Correos plate dating back to 1930, used for postal deliveries.
The equipment used at postal sorting centres included sorting tables, bundling machines, pigeonholes, sack-carriers, etc. All of these elements are recreated in the exhibit.
The correspondence-delivery area concludes the postal communication cycle. Delivery to the addressee is done by hand, either to a Correos post office box or the addressee's home letter box.
Some curious additions to this hall are a collection of pre-philatelic letters from before the advent of the stamp and another collection of hieroglyphic letters in which the address of the recipient is indicated with hieroglyphs. These letters were delivered to their addressees and circulated in the post from 1940 to 1960. This method is prohibited today. One of them was sent by Daniel Vázquez Díaz, a renowned painter whose pictorial work is associated with Cezanne and the cubist movement.