Reducing spam with OpenBSD and spamd
We all know about the rampant spam email problem. Nearly all of the potential solutions offered for it are based on the idea of the mail server receiving messages, classifying them as either spam or legitimate, and then processing further (deleting or forwarding messages) as appropriate. The problem with this strategy is that you end up using extra resources on the mail server. Here's a way to get the same result while minimizing resource usage by preventing the spam from reaching the mail server.
For this task you can use the OpenBSD platform, for two chief reasons:
1. OpenBSD is secure and solid.
2. OpenBSD comes with a tool to stop the spam before it even gets sent: spamd, a "fake" Simple Mail Transfer Protocol (SMTP) server that accepts SMTP connections and decides whether a sender is a spammer or not.
Spamd is not an email content analyzer; it does not actually examine a given email's payload. What spamd does is determine -- before the email is ever allowed to be sent in the first place -- whether the sender itself is a spammer or not.
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