Lots of unknowns here in your question:
Is the milk delivered in a glass bottle? Is it homogenised? Is it from grass fed cattle, or hybrid fed, or is it stall method produced? Is the milkman sourcing his milk from a variety of farms?
I never heat milk in a microwave, always use a milk pan on the stove. I avoid Homogenised milk due to the homogenisation process causing the fat globules to be absorbed through the alimentary canal wall directly into the blood stream instead of the fat being broken down by gut microbes. I prefer my milk raw – unpastuerised and full fat – the taste is exceptional. I often refer to this milk as 94% fat free when questioned!
I drink only tea, made in a tea pot with loose leaf, strong and with the raw milk – what my dad used to call BWM tea (British Working Man tea!). When I lived and worked abroad I would ship my own tea and use sweetened condensed milk (Nestle being the best) bought locally.