The Mutt E-Mail Client : Reference : Configuration variables : envelope_from
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## 6.3.45. envelope_from

Type: boolean
Default: no

When set, mutt will try to derive the message's envelope sender from the "From:" header. Note that this information is passed to sendmail command using the "-f" command line switch, so don't set this option if you are using that switch in $sendmail yourself, or if the sendmail on your machine doesn't support that command line switch.

The Mutt E-Mail Client : Reference : Configuration variables : envelope_from
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