Phishing headers 101
Received, Return-Path and the three headers that lie.
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Read Received headers from the bottom up: the lowest one was added first.
Updated 5 November 2026
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SQL injection, explained with one query
Why concatenating input into SQL breaks, and why parameters fix it for good.
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Reading auth.log in five minutes
The four fields that matter in every SSH line, and the one command that finds password guessing.
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