The disclosure concerns systems and methods for extracting data from documents. A computer receives a message from a sender. The message has the electronic document and an electronic address of the sender. Based on the address of the sender the computer selects a map that comprises location data of data fields and determines values of the data fields by extracting data from the electronic document using the location data of the selected map. Since the computer selects the map based on the address of the sender the computer does not need to rely on the content of the electronic document to select the correct map to use, which makes the selection less prone to errors and the method can be used with existing email systems.