On Tue, 12 Mar 2019, at 09:26, Jesse Thompson via mailop wrote:
> When someone reply-alls to a munged message it only composes a message to the
> Reply-to and the Cc, but ignores the From (the list address is munged into
> the From header).
That sounds exactly what I would expect for "Reply All"; it's certainly what's
implemented at FastMail.
* Reply => message is "to" either the Reply-To address if specified, otherwise
the From address.
* Reply All => Contents of To/Cc of message being replied to are also added to
the new email (except for your address).
I would be very surprised to see a client add both the From and Reply-To
address as recipients on reply-all. Let's see what RFC5322 says
<https://tools.ietf.org/html/rfc5322#section-3.6.3>:
When a message is a reply to another message, the mailboxes of the
authors of the original message (the mailboxes in the "From:" field)
or mailboxes specified in the "Reply-To:" field (if it exists) MAY
appear in the "To:" field of the reply since these would normally be
the primary recipients of the reply. If a reply is sent to a message
that has destination fields, it is often desirable to send a copy of
the reply to all of the recipients of the message, in addition to the
author. When such a reply is formed, addresses in the "To:" and
"Cc:" fields of the original message MAY appear in the "Cc:" field of
the reply, since these are normally secondary recipients of the
reply.
Yes, that sounds about right.
Neil.
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