Dnia 20.01.2020 o godz. 20:14:48 Wesley Peng pisze:
> 
> Thanks all answers for kind info.
> My requirement is, for example, when refrigerator found there were no food
> in itself, it will send an email to remind the people.
> But refrigerator may not connect to internet directly, only home router
> have direct access to internet.
> So how to implement this mail sending feature?

Port forwarding on router from internal network to your actual mail server
would be enough.
-- 
Regards,
   Jaroslaw Rafa
   [email protected]
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."

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