Erik Wienhold <ewie@ewie.name> writes:
> On 2024-10-11 15:00 +0200, iseki wrote:
>> But why the mailing list haven't use the "Reply-To" header specify where to
>> reply? Because the mail is you send to me directly?
> The message author sets Reply-To, if necessary, according to RFC 5322.
> Are there mailing lists that actually set this header?
It's been done in the past, but current practice is strongly against
it. For example, in your own message that I'm replying to, there's
a DKIM signature (RFC 6376):
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ewie.name; s=MBO0001;
t=1728654419;
h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
to:to:cc:cc:mime-version:mime-version:content-type:content-type:
in-reply-to:in-reply-to:references:references;
bh=7w7CHebdKaXtlhCMxa/jNIcoEy1tFhZmzOD+dT7nP8k=;
b=K3s//HzYXU+chTDeY5p/wGwd5eglESiaugVSpGWo49ryL9ajLdimYMD3uIc3rr8PglZizV
nk2wDiMsHnLR0EAgKsGzNvtxt4N9hHxMk7UI3F4XOVYqnemk95YVRNpFpEFww833uUqA+9
RPypj/ezsKbi2vBzzXIoZ+Tf3t6XfuZYf6poq1J+ud0X278yQMnA1XbZNsenQkCWoYPiXb
yklxY2Nbp9NyiDHCDQ0KPYAT6/0ttzbprNhgSzhN7LND6ehUvLlsmKG3rwqby2LmFRwliQ
RDZ4MAxEzZKfOr8HGnubQf8FdQPGw6jlAn3U8199c+3QcIAWJ99Wrtb5rQPdEw==
That lists "reply-to" as one of the signed header fields. So if the
mailing list were to modify Reply-To (including inserting one where
there was none before) a DKIM-verifying recipient would regard the
message as a forgery.
regards, tom lane
