Oh yes, I was looking at the detailed headers from my webmail version.
only 4 tags displayed with details turned off, 43 header tags in detail.

But no mailing-list, closest is list-id.

Many of the tags are prefixed X- and appear to be tags added by the ISP's virus and spam processing or details of the message routing.

examples
X-Spam-Status
X-Spam-Checker-Version:
X-Virus-Status:
X-USANET-Received
X-USANET-Source
X-Mailman-Version:  2.1.21

Perhaps the ISP's Mailman translates the mailing-list tag to list-id.
(and 5 other list- tags)
If so, I wouldn't be surprised if other ISPs made comparable updates, so a general 'rule' to filter on mailing-list may not be as universal as suspected.

No one filter plan works for all ISPs and mail agents and webmails, etc.
Except for filtering by the subject line tag for the list.
Hence for the preponderance of lists using subject line tags.


On 04/10/2018 10:23 PM, Adonay Felipe Nogueira wrote:
2018-04-10T21:44:15-0400 William Bixby wrote:
Interesting, in my emails from Gnucash I do not see any headers with tags
mailing-list
mailed-by

Depends on email reader software (or webmail if you use it), although
good webmail also let's you inspect the message in raw form (which will
of course show all header fields).

On most of them I see a tag
List-id
But that is not a field I can filter on from my ISP

In this message from Dave I see my email as the to: and
Gnucash Users <gnucash-user@gnucash.org  as the CC: but there is no List-id

Note that since you don't see "List-id" it means that the email message
came directly to the server of the email service provider you rely on
--- that means it didn't pass over the mailing list at the time the
message came to you ---, you should by now also have received a
duplicated message that comes from the mailing list bouncer and which
has the "List-id" header field.

So the filters Dave suggests would be incomplete, a CC is also needed.
Maybe also a 'From' just to be sure?

The emails from the list seem to have a variety of header forms,
perhaps depending on the mailers used for the reply, or the reply-to
or reply-list or reply-all forms. Seems hard to keep track of all the
possibilities.

Instead of requiring 2-3 or more filters for each list, the subject
code allows a single filter to do the job, consistently, never misses.

Some filters allow you to match field names with a regular expression
standard/syntax --- /e.g./: "^\(To\|Cc\|List-id\)" if they have
separated space to match only the field *names*, or
"^\(To\|Cc\|List-id\):.*gnucash-user@gnucash\.org" if they don't, both
examples use GNU Emacs regular expressions but the email filter you use
might require other syntax --- or the filter might also allow you to
chain some condition checks --- /e.g./: ( To OR Cc OR List-id ) ==
"gnucash-user@gnucash.org".
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Bill Bixby
Laconia NH
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