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Only if your business is in an industry like finance, gambling, telecommunications, gaming, and government should you be worried but if that's the case you wouldn't be using the free or cheap options.

As pure SMTP relay I recommend Mailpace. Cheap with great deliverability

Also, I definitely recommend updown.io for web monitoring, cheap and extremely reliable.

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I went with an ubiquiti a long time ago, back when they were cheaper than they've been pushing out lately. Though, I'm still super happy with my setup! Though yeah, even an old PC with multiple nics,

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Orange pi is cheap in my country. You don't need multiple lan ports on the board itself, the orange pi R1 has 2 lan ports that you could configure one as your WAN and the other one as your lan and con

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an umanaged switch. This setup could be really cheap

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I think Xiaomi AX3000T is a very cheap and capble option to run OpenWrt. I personally use Podkop for PBR to route specific sites through my vpn and block all ads

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