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In an F command, rather than specifying the name of a file, specify
the name of a directory or a device such as /dev/null. Does
sendmail care? How does it handle (or not handle) nonfiles? Use /usr/dict/words as a class file. Does reading a huge file
slow sendmail down noticeably? Does this suggest that a database
might be more efficient for some needs? Are there security concerns surrounding use of the F command? Imagine ways in which a cracker might exploit a careless use of the F command to compromise your system. Skip ahead to
Section 22.4.2, "The F Command - File Form" to explore this question further.
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