Well, we can at least partially check your setup, but you must give us your domain,…
Other than that it’s just guessing,.. if I read it right your own Rspamd is think your LTD is “fishy” 🤣 so what do you expect from third-party server? 🙄
kolaente Is it possible that someone is forging their IP address so that the mailcow thinks the mail is coming from an allowed network?
Well in theory, but unlikely, attacker would have be men in the middle in close proximity (like your ISP and more considering encryption,…) or on compromised system,…
kolaente Why does the mailcow even allow sending mail as unauthenticated sender?
That’s depend on point of view, but random entity on internet is not allowed sending without auth in default MC configuration,…
But as i wrote, give us your mail and we can run some test for you,…