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m4 sees files as streams, but recognizes newline characters
as significant
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Normally, # sets off a comment, as in many languages
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But...! The macro files used by Sendmail disable this so
that comments beginning with "#" can be passed through to sendmail.cf
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Sample .mc files for Sendmail use divert(-1)
and divert(0) to comment out blocks of text. This is dangerous!
May have unexpected side effects.
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Best to use dnl (delete to newline) macro
for all comments and at ends of all commands
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