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qpsmtpd documentation

Most of the qpsmtpd documentation was written by me. These docs can also be found in the docs/ directory of the qpsmtpd git tree.

Best place to start reading is the plugin documentation. This was the main documentation about the qpsmtpd internals until it was split into multiple files:

The config documentation gives a short overview of qpsmtpd core config settings and some settings from commonly used plugins.