253924 - Sender: header should be shown as "On behalf of"

Status: RESOLVED DUPLICATE of bug 221054

(Thunderbird :: Mail Window Front End, enhancement)

Description

[Florian Effenberger]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; de-DE; rv:1.7) Gecko/20040707 Firefox/0.9.2
Build Identifier: 0.7.2

If I remember correctly, a "Sender:" header usually means "On behalf of". I'm
not quite sure, so please check the RFCs (I don't know where to search exactly).

If this is the case, Sender: should be shown as "On behalf of".

Example:
From: [e-mail]
Sender: [e-mail]

The sender should be seen as "From: [e-mail] [On behalf of
[e-mail]]". AFAIR, Outlook does something like that.

Reproducible: Always
Steps to Reproduce:
1.
2.
3.

Comment 1

[Jo Hermans]

From <http://ftp.rfc-editor.org/in-notes/rfc2822.txt>, para 3.6.2 :

   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.

So it's actually the opposite. Your example should be:

From: [e-mail]
Sender: [e-mail]

But the header could indeed be shown as "From: [e-mail] [On behalf
of [e-mail]]". But I don't know if everyone would agree, because the
'from' header is more important. On mailinglists, 'sender' can be the address of
'owner' of the list. See dicussion in bug 40934, although it's about another issue.

Comment 2

[Jo Hermans]

See Seamonkey bug 221054

Comment 3

[Scott MacGregor]

*** This bug has been marked as a duplicate of 221054 ***