At what level do ISPs control ports?

KasanMoor@beehaw.org to Technology@beehaw.org – 42 points –

I'm aware most ISPs do not allow for port 25 to be open for email use outside of business licenses, but at what level is that controlled? Can I get around that by owning my own router? Owning my own modem or ONT? Or is this just a thing they mystically control further up the pipeline that a relative layman such as myself can't get around?

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You can use a port reflector service. No ip.com might still offer it. Basically forwards anything incoming to their ip on port 25 to your ip and whatever port you specify.

@Brkdncr @KasanMoor I don't think they care about incoming port 25, the blocking being talked about is outgoing 25.

I just looked they have a service called “alternative port 25” that addresses this issue.

Honestly though, once you start adding up costs for these workarounds you have to wonder if it’s easier to just get a business internet circuit, cloud security gateway, or just host the email online.