Quote:
Just make outgoing ports open by request only.


But that adds administration cost, meaning that prices go up. Smaller ISPs should frankly just block incoming/outgoing SMTP, and you should use their host.

If you have a problem with that, pay extra for a bigger ISP, or for a business tariff. I pay for the business tariff on my DSL line, which means that I am explicitly allowed to run servers.
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-- roger