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Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Real email security gateways cost money. There’s no good way to deal with it at small scale.
They don't have to cost money. The mail filter appliances are all based on postfix, spamassassin and a virus scanner like clamav. The thing you pay for is the nice gui.
If only that were true.
I genuinely don't understand what you are paying for. I must have missed something.
It is, I looked at several vendor's and it's all te same except for the nice gui. They all have their own blacklist that they feed with the spam/ham queries from their devices.
Depends what you mean by "security"