Abstract: A technique for customizing data transmissions based on recipient-specific formatting rules is described. According to a method aspect of the present invention, a data structure having a plurality of data items is subjected to a formatting step before being transmitted via the computer network to a recipient, and the formatting step is based on a predefined formatting rule. The predefined formatting rule may be a recipient-specific formatting rule obtained by the following steps: receiving a request for an adaptation of a standard formatting rule for a specific recipient; transmitting menu information enabling a specification of adaptation instructions; receiving, in response to the transmitted menu information, adaptation instructions pertaining to the recipient; and generating the recipient-specific formatting rule, for example by adapting the standard formatting rule in accordance with the received adaptation instructions.