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@ -125,6 +125,25 @@ The environment variable
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.Ev PIPE_CHARSET
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.Ev PIPE_CHARSET
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will be set to the charset declared in the MIME part,
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will be set to the charset declared in the MIME part,
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if known.
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if known.
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.Pp
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Filters can communicate with
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.Nm
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using their exit status:
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.Bl -tag -compact -width 8n
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.It 0
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The output is printed as plain text.
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.It 62
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The output is printed raw, without escaping.
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.It 63
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Behave as if the filter never ran.
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.It 64
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The output is a RFC5322 message that should be rendered again.
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.It 65 to 80
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Render the
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.Va n Ns \&- Ns 64th
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part of this text/multipart part.
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.El
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All other exit statuses are regarded as errors.
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.Sh ENVIRONMENT
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.Sh ENVIRONMENT
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.Bl -tag -width MBLAZE_NOCOLOR
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.Bl -tag -width MBLAZE_NOCOLOR
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.It Ev MBLAZE_PAGER
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.It Ev MBLAZE_PAGER
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