  We present an X-ray imaging and spectroscopic study of the molecular cloud
interacting mixed-morphology (MM) supernova remnant (SNR) G346.6-0.2 using
XMM-Newton. The X-ray spectrum of the remnant is well described by a
recombining plasma that most likely arises from adiabatic cooling, and has
sub-solar abundances of Mg, Si, and S. Our fits also suggest the presence of
either an additional power-law component with a photon index of $\sim$2, or an
additional thermal component with a temperature of $\sim$2.0 keV. We
investigate the possible origin of this component and suggest that it could
arise from either the Galactic ridge X-ray emission, an unidentified pulsar
wind nebula or X-ray synchrotron emission from high-energy particles
accelerated at the shock. However, deeper, high resolution observations of this
object are needed to shed light on the presence and origin of this feature.
Based on its morphology, its Galactic latitude, the density of the surrounding
environment and its association with a dense molecular cloud, G346.6-0.2 most
likely arises from a massive progenitor that underwent core-collapse.
