My wine smells bad, is it normal?

It is quite common to notice rather odd smells during the fermentation process. The musty smell of reduction sometimes appears during the (alcoholic) fermentation. It could happen, from time to time, that the wine doesn’t smell as good as you anticipated during the early days after the end of the vinification process. Most often this is because of a by-product of the work of the yeast that converted the sugars to alcohol. Wait a few weeks at the most and the smell in question will have disappeared. If you adequately filtered your wine, leaving no sediments, your wine should not smell bad post-fermentation.