message: Responses
5.1 Responses
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To determine where a message is to go, the following algorithm is used
by default.
“reply”
A “reply” is when you want to respond _just_ to the person who sent
the message via mail. There will only be one recipient. To
determine who the recipient will be, the following headers are
consulted, in turn:
‘Reply-To’
‘From’
“wide reply”
A “wide reply” is a mail response that includes _all_ entities
mentioned in the message you are responding to. All mailboxes from
the following headers will be concatenated to form the outgoing
‘To’/‘Cc’ headers:
‘From’
(unless there’s a ‘Reply-To’, in which case that is used
instead).
‘Cc’
‘To’
If a ‘Mail-Copies-To’ header is present, it will also be included
in the list of mailboxes. If this header is ‘never’, that means
that the ‘From’ (or ‘Reply-To’) mailbox will be suppressed.
“followup”
A “followup” is a response sent via news. The following headers
(listed in order of precedence) determine where the response is to
be sent:
‘Followup-To’
‘Newsgroups’
If a ‘Mail-Copies-To’ header is present, it will be used as the
basis of the new ‘Cc’ header, except if this header is ‘never’.