worst case scenario the device won’t work. example: some Axis cameras are “PoE++” and need special switches to power them. if you plug normal PoE devices into such switches however, they will be fine as the switch knows only to send regular low-calorie PoE to those devices.
PoE is all 48v and the only difference is the available power which is switch-dependent.
the data protocol negotiates the power requirement - it’s not like plugging a 110v device into a 220v outlet.
can you host an email server at home: yes nothing is stopping you.
the question you meant to ask: will it send and receive email with providers like gmail, M365 etc.
the answer to that question: no.
what about Amazon SNS? i believe it’s $0.50 for one million sms messages
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you can join cut cables together with a back-to-back adapter but expect some signal/speed loss. better to change the whole cable and maybe run it inside a conduit if it’s outside.
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