From Newsgroup: comp.mobile.android


the global "ignore" filter automatically ignores all articles in all newsgroups, except for articles with overview headers that have been
filtered in other ways, generally, either whitelisted or blacklisted,
promoted, watched, retained, or demoted, ignored, purged, moved, etc.

most newsreaders have some filtering capabilities, this current list
of freeware newsreaders includes most of the popular/familiar titles:

(using Tor Browser 15.0.11) >http://usenet-fr.yakakwatik.org/newsreaders.html

Last update: 05/06/2025
Introduction
Newsreaders
40Tude Dialog (Windows)
Betterbird (Linux / Windows / macOS)
Claws-Mail (Linux / Windows / macOS)
Evolution (Linux)
flnews (Linux, UNIX systems)
Gnus (Linux / Windows / macOS)
Gravity (Windows)
MacCafe (macOS)
MacSOUP (macOS = 10.14)
MesNews (Windows)
ModNewsreader (Android and its forks)
Pan (Linux / macOS)
SeaMonkey (Linux / Windows / macOS)
slrn (Linux / Windows / macOS)
Sylpheed (Linux / Windows / macOS)
Thunderbird (Linux / Windows / macOS)
tin (Linux / Windows / macOS)
Xananews (Windows)
Xnews (Windows)
References and useful links

[end quote]

the single asterisk wildcard "*" identifies everything as one thing,
e.g., in 40tude dialog "scoring and action", the first rule is this:

[*]
#global
-1 From *
!ignore From *

which automatically scores all otherwise unscored articles with "-1"
in red text, next to the familiar red ignore flag "prohibited" icon,
and other rules are applied subsequently, e.g., demoting crossposts:

[*]
# demote cross-posts, darken color
-1110 Xpost %>1
!setcolor(silver;maroon) Xpost %>1
-1111 Xpost %>2
!setcolor(maroon;gray) Xpost %>2
-1111 Xpost %>3
!setcolor(gray;olive) Xpost %>3
-1111 Xpost %>4
!setcolor(olive;gray) Xpost %>4
-1111 Xpost %>5
!setcolor(navy;black) Xpost %>5

thus crossposts are progressively demoted and darkened, adding the
previous "-1" from the first rule, so that any "newsgroups" header
with one comma "," is demoted to -1111, if two commas -2222, three
commas -3333, four commas -4444, five commas -5555 . . . darkening foreground/background color makes the "subject" header in messages
less distracting, then beautifully illegible beyond two crossposts

conversely, articles posted by helpful/honest/organic contributors
can be unignored and undemoted, simply by scoring overview headers separately or in combination, e.g., if the "from" header is unique

[*]
# whitelist normal
+1 From "user001" "user002" "user003" "user..."
!unsetwatchignore From "user001" "user002" "user003" "user..."

promote self to maximum score, highlight color, adding entries for other servers, xover/non-xover headers, users, aliases, topics etc.

[*]
# whitelist promote
=+9999 From "self <is@was1>"
!keep,unsetwatchignore,setcolor(red;yellow) From "self <is@was1>"

thus, whitelisted text strings in overview headers are normalized,
unignored, allowing those articles to appear normally in the news-
reader, and a select few are promoted, saved, watched, researched, etc., but the vast majority of usenet articles are simply ignored,
any replies to ignored articles are obscured in collapsed threads,
then purged at the user's discretion...sayonara to the troll farm


--- Synchronet 3.21f-Linux NewsLink 1.2