On Sat, 2025-10-18 at 12:40 +1100, Stephen Morris wrote:
> Thanks Patrick, the "correspondents" is a column in the inbox as
> presented by Thunderbird, I'm not sure what the column is presenting 

That seems like it's something that handles showing message FROM
addresses somewhat differently than just the FROM header.  Perhaps
looking at other headers if FROM isn't present, or how it handles
multiple addresses?  Or maybe acting as an automatic FROM or TO
display, depending on which folder is being looked into.  I really
couldn't tell from my brief poking around at various folders with
differently addresses messages to test against.

The latter (auto FROM/TO display) seems to be what it's intended for,
going by what I can read about it, with either inward or outward
pointing arrows next to an address to indicate which direction.  And
only making sense for those with a mix of sent and received messages in
the one folder (such as Gmail's abomination of dumping everything into
one box, and you having to *search* for things).

Anyway, that's just how it will list the emails present in whatever
folder you're looking at.  When you reply, the headers in the
particular *message* will be paid attention to.

> as for my replies it shows "Community Support" but for you is shows
> "Patrick O'callaghan <[email protected]". I've removed that
> column and replaced it with a "From" column, which identifies your
> emails as you and my replies as me, but for Michael it shows the
> "From" as "Community Support".
> What now wondering is Thunderbird not interpreting things correctly, 

That's the list server changing it.

If a message has come from someone who's address might be a problem as
far as anti-spam handling is concerned (for it, or list mail
recipients), then it changes the details to its own email address.

For many domain names, only *some* mail servers are authorised to send
mail from that address (this will be all of their own mail servers,
which won't include the list mail server).

This is an anti-spam technique.  Anything else purporting to send their
mail from another server is conversely not authorised, with two common
consequences:  When going through servers that check for validity, the
mail is marked as probably spam, and the mail *may* be automatically
rejected.  (*)

The list server is authorised to send mail from its own address, so
that's what it sends such mail addressed FROM.  And it adds the
sender's and recipient's address(es) in the CC field, which still
allows someone to make direct replies if necessary.

* The authorised mail server DNS records lists which mail servers are
authorised to handle its mail, and can suggest that recipients of
unuthorised mail should flag it as spam and let the recipient deal with
spam handling, or that unauthorised mail ought to be automatically
voided in some way (rejected or deleted) never being delivered to the
recipient.  The recipient mail server can follow those suggestions, or
ignore them.


-- 
 
uname -rsvp
Linux 3.10.0-1160.119.1.el7.x86_64 #1 SMP Tue Jun 4 14:43:51 UTC 2024 x86_64
(yes, this is the output from uname for this PC when I posted)
 
Boilerplate:  All unexpected mail to my mailbox is automatically deleted.
I will only get to see the messages that are posted to the mailing list.
 

-- 
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