The authors report on angle- and energy-resolved spectroscopy of secondary electrons from Fe(110). Intensity and polarization distributions in normal emission as a function of energy of the primary electrons are studied. For the first time angle-resolved spectra as a function of emission angle are measured and compared to theoretical calculations of the polarization fine structure. The influence of oxygen exposure on the polarization spectra is studied and surface-related features are identified. The authors conclude that surface resonances as well as the bulk band structure both contribute to the polarization fine structure. Consequences for the analysis of magnetic microstructures in a scanning electron microscope with polarization analysis are pointed out.