I highly recommend not wasting time on this and using something like sendgrid. The cost is so little and you’ll save an inordinate amount of time

Dynamic RAM tracks bits by using a capacitor for each bit. Caps’ charge bleeds out so you have to top it off again every so often. The way you do that is to just write the same data back again. So it reads and writes the same data to itself every refresh. The opposition to this is static RAM which does not use a capacitor and is just a clever arrangement of transistors. No refresh needed. It’s not typically used commercially except under special requirements, though as transisters are significantly more expensive. So the refresh strategy is the better choice for consumer hardware. DRAM has been dominant for decades.

I use obsidian too. It supports mermaid too so you can make your network diagram with it.