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Set the address of the sender of a locally-generated message.
This option can normally be used only by root or the Exim user
or by one of the configured trusted users. However, anyone may
use it when testing a filter file with -bf or when testing or
verifying addresses using the -bt or -bv options. In other
cases, the sender of a local message is always set up as the
user who ran the exim command, and -f is ignored, with one
exception. If the special setting -f <> is used by an untrusted
user, it does not affect the sender for the purposes of managing
the Sender: and From: headers, but it does have the effect of
causing any SMTP transmissions to be sent out with ...