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bytes); return them to the sender instead.
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.IP "\fBuser\fR=\fIusername\fR (required)"
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.IP "\fBuser\fR=\fIusername\fR:\fIgroupname\fR"
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specified \fIusername\fR. The software refuses to execute
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commands with root privileges, or with the privileges of the
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mail system owner. If \fIgroupname\fR is specified, the