PigeonReader is the Web mail client of the PigeonAir project, a solution for easily building clustered, scalable, and modular email services. PigeonReader is completely UTF-8 compliant, allowing any charset to be used. It is based on XML, which allows skins and themes to be easily written using the XSLT language. It was written to be easily used in a cluster of Web servers, where multiple and different domains are to be managed transparently to the end user, possibly with different skins, features, and configurations.