- Edited
Ok now I understand it. Its 2000 āfromā addresses. However I do not understand what you are doing with all those newsletters
I would still propose to use a shared folder for this āone inboxā and make this accessible (āfreigebenā as I think you are german) to your internal users.
This way you have only one ruleset in place. Your ruleset above seems wrong, as it is selecting on ātoā instead of āfromā.
You can also have a look at ā+ā addressing, it would automatically create subfolders depending on your alias.
E.g. you have you have ādomain.deā as your mailcow domain. You have a user with āhoneypot@domain.deā as āthe all in oneā mailbox.
So you can use āhoneypot+adidas@domain.deā without any additional effort, and mailcow will automatically create a folder āadidasā and file received mails into that folder. This can then be shared with agent1..n@domain.de.