GNU Mailutils
	General-Purpose Mail Package	Official GNU Software

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3.5.2.15 Controlling Sender Fields

When mail needs to know the sender of a message, it looks it up in one or more headers of that message. Such headers constitute a sender list. The first header from the list that is present in the message and has a non-empty value is used. If none is found or if the sender list is empty, the value of the message envelope is used.

The commands sender and nosender manipulate the sender list.

If the command sender is used without arguments, it displays the contents of the sender field list. If arguments are given, each argument is appended to the sender field list. For example:

? sender
Sender address is obtained from the envelope
? sender mail-followup-to reply-to
? sender
mail-followup-to
reply-to
? sender from
? sender
mail-followup-to
reply-to
from

Command nosender is used to remove items from the sender field list:

? sender
mail-followup-to
reply-to
from
? nosender reply-to
? sender
mail-followup-to
from

When used without arguments, this command clears the list:

? nosender
Sender address is obtained from the envelope