The doc Directory
The doc directory contains only one subdirectory, op. The doc/op directory contains the sendmail “INSTALLATION AND OPERATION GUIDE.” That guide is supplied in troff(1) source (op.me), and as a ready-to-print PostScript document (op.ps).
This is the main document distributed with sendmail that describes that program. It is succinct, and it is always a good place to start for a quick but detailed overview.
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