Bonjour-bonjour,
En faisant une comparaison de santé email par hasard, je vois :
blacklist mc01.ouvaton.coop Blacklisted by BACKSCATTERER blacklist mc02.ouvaton.coop Blacklisted by BACKSCATTERER
C’est juste pour vous tenir informé-es au cas où.
Bonne soirée à toutes et tous 
Bonjour,
Notre infogérant suit quotidiennement l’état de nos serveurs dans différentes listes de ce type.
Celle-ci (BACKSCATTERER) n’est pas très gênante et c’est en plus une liste qui propose un delisting express… qui est facturé !
Pas très sérieux donc (on delist quand il n’y a plus de spam, pas quand on sort le portefeuille).
On devrait en sortir automatiquement dans 3 semaines.
Testresult for 194.36.166.22:
This IP IS CURRENTLY LISTED in our Database.
Please note that this listing does NOT mean you are a spammer, it means your mailsystem is either poorly configured or it is using abusive techniques.
This kind of abuse is known as BACKSCATTER (Misdirected Bounces or Misdirected Autoresponders or Sender Callouts). Click the links above to get clue how and why to stop that kind of abuse.
To track down what happened investigate your smtplogs near 15.02.2024 14:43 CET +/-1 minute.
You will either find that your system tried to send misdirected bounces or misdirected autoresponders to claimed but in reality faked senders, or your system tried sender verify callouts against our members near that time.
So you should look for outgoing emails that have a NULL SENDER or POSTMASTER in MAIL FROM.
Reading your logs carefully it shouldn't be a big deal to figure out what caused or renewed your listing.
History:
12.10.2021 02:25 CEST listed
09.11.2021 02:25 CET expired
16.05.2022 05:50 CEST listed
13.06.2022 06:25 CEST expired
06.12.2022 20:18 CET listed
03.01.2023 20:26 CET expired
18.05.2023 18:26 CEST listed
24.08.2023 18:25 CEST expired
12.10.2023 17:36 CEST listed
09.11.2023 18:27 CET expired
15.02.2024 14:43 CET listed
A total of 2 Impacts were detected during this listing. Last was 15.02.2024 14:43 CET +/- 1 minute.
Earliest date this IP can expire is 14.03.2024 14:43 CET.
This IP is temporary listed.
The listing will expire automatically and free of charge 4 weeks after the last abuse is seen from that IP.
Expedited manual expressdelisting is available as an option, in case you do not want to wait for the automatic and free expiration.
You will be charged 89 CHF using the following payment service.
WARNING: Before requesting expressdelisting make sure the problem which caused the listing is fixed, otherwise you are at risk to get listed again if new abuse becomes known.
Abusé le coup des 89 Franc suisse quand même 
Merci beaucoup pour l’info 