[GNC] Addition of Mailing List Subject Prefix

[William Bixby]

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 at 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 at 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 at gnucash.org".
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-- 
Bill Bixby
Laconia NH