The philosopher differed radically from Descartes in the fact that he believed that every physical manifestation to be found (and evidenced of a body or a sensory perception of something) stemmed from an idea. Spinoza contended that thoughts begot the physical process of motion, creation, or any other physical application, and that the intellect which produced such thoughts and the physical manifestations of them should therefore not be considered distinct from one another. It is noteworthy to mention that Descartes also held a an alternate account of the mind-body dualism in which he conceded there could be some incomprehensible union, for which he offered no explanation for and therefore cannot defensibly be compared to Spinoza's conception of this union (Ross, 1998). Therefore, when considering Spinoza's regards for human emotions as to whether or not they are part of bodily or mental processes, the answer is he believes they are related to both -- since the philosopher believes that there is no distinction between the mind and the body, the intellect and the sensory. According to Spinoza, emotions are simply another "mode" (Carlisle, 2011) that is a form of...

Furthermore, Spinoza considers most emotions to merely be variations of the two extremities perceivable to people, joy and sadness (Carlisle, 2011). To this end, such emotions can either be physical or mental in their conception, particularly since the philosopher sees no distinction between these two aspects of human existence.
References

Carlisle, C. (2011). "Spinoza part 6: understanding the emotions." The Guardian. Retrieved from http://www.guardian.co.uk/commentisfree/belief/2011/mar/14/spinoza-understanding-emotions

Ross, G.M. (1998). "Spinoza: Summary of His Philosophy." Retrieved from http://www.philosophy.leeds.ac.uk/GMR/resources/summaries/spinoza/spinsum.html

Skirry, J. (2006). "Rene Descartes: The Mind-Body Distinction." Internet Encyclopedia of Philosophy. Retrieved from http://www.iep.utm.edu/descmind/

Smith, K. (2010). "Descartes' Life and Works." The Stanford Encyclopedia of Philosophy. Retrieved from http://plato.stanford.edu/archives/fall2010/entries/descartes-works