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Specifies a file containing a list of text replacement rules that are
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applied to the message header fields to replace certain content expected to be
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changed as the message passes through local MTAs. This can be used to
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"masquerade" features. Each entry in the file consists of a POSIX regular
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expression, followed by a tab (ASCII 9), followed by the text that should
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be used to replace the text matching the expression. The '#' character