I haven't tried it but if it chicken wire has enough metal in it, it should work, in principle. I don't get great reception in my chicken run wrapped in chicken wire, if that makes for a good sign.

Fun thought. I'd try wrapping their wifi router in a faraday cage of chicken wire, test that the signal isn't going out with a nearby smartphone, then plug ethernet from their to my own wifi router.

I have some tech skill and this option looked flat out daunting to me. Then when considering the cost of domain, it looked more expensive than choosing a mail service.

Does anyone know a good guide for own mail server, including getting cheap enough domain?