The mailing list for listmasters using Sympa

[IKEDA Soji <address@concealed>]

Hi David,

> 2021/01/11 15:44、David Carter <address@concealed>のメール:
> 
> On 2021-01-11 05:05, Youcef N Baouchi wrote:
>> Hi Soji,
>> A screenshot is attached. For some reason the -request address
>> sometimes gets cached which causes people to email -request alias
>> instead of the actual list. But when I look at the headers the
>> -request address is in the sender field not the from field.
> 
> Given:
> 
> From: <email>
> Sender: address@concealed
> 
> Outlook will display:
> 
> address@concealed on behalf of <email>
> 
> This has always been Microsoft's interpretation of 
> https://tools.ietf.org/html/rfc5322 :
> 
>   3.6.2.  Originator Fields
> 
>   ...
> 
>   The originator fields indicate the mailbox(es) of the source of the
>   message.  The "From:" field specifies the author(s) of the message,
>   that is, the mailbox(es) of the person(s) or system(s) responsible
>   for the writing of the message.  The "Sender:" field specifies the
>   mailbox of the agent responsible for the actual transmission of the
>   message.  For example, if a secretary were to send a message for
>   another person, the mailbox of the secretary would appear in the
>   "Sender:" field and the mailbox of the actual author would appear in
>   the "From:" field.  If the originator of the message can be indicated
>   by a single mailbox and the author and transmitter are identical, the
>   "Sender:" field SHOULD NOT be used.  Otherwise, both fields SHOULD
>   appear.
> 
> It looks like they focused on the bit which reads "if a secretary were to 
> send a message for another person".
> 
> Sympa isn't doing anything wrong: other Mailing List Managers also add 
> Sender: headers.
> 
> I guess there is an argument for not adding a Sender: header given that the 
> last sentence is a SHOULD rather than a MUST.

It is a discussion that has repeated many times in anywhere dealing with 
mailing list system.  However, removing “Sender:” field with list’s address, 
instead of originator’s address, will prevent delivering any messages sanely 
via mailing lists among the Internet.

When Outlook users complain, you (administrator of the list) _may_ remove 
“Sender:” field by setting “remove_outgoing_headers” parameter, IF your list 
was used _only_ by users of Microsoft’s network.  —— If not, any users are 
receiving messages via Internet, “Sender:” field should never be removed.

Regards,
—Soji