I immediately thought of the old crystal radios and a short search brought up this comparison.
While old radios used a natural mineral (galena) to detect radio waves, modern Rydberg radio receivers use a synthetic photonic crystal (often made of silicon or glass) to guide and enhance the radio signal for improved performance.
They are magical! A radio powered by the transmitter, it's an incredible thing, really. The trick is that the diode is a very low forward drop one, typically Germanium, which has only 0.2V forward drop. But for more magic, you can also use a razor blade or a little bit of lead and then seek for naturally occurring diodes on the surface of the material. These can be even more sensitive than the Germanium ones.
I offered to host a friends business email on my DO instance.
Works 99% of the time but every now and then emails just disappear only to find out that MS and Apple block DO IP addresses, sometimes.
Silently.
There is a war on small email providers it seems.
The biggest war on small providers is waged by other small providers. They can be ancient and outdated or simply extremely picky. Which makes everything Google or others require a piece of cake, which it actually kinda is.
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