A possible solution against libel is to provide an unspecific accusation, something like “I say that X is seriously a bad person and should be avoided, but I refuse to provide any more details; you have to either trust my judgment, or take the risk
You’re probably safe so long as you restrict distribution to the minimum group with an interest. There is conditional privilege if the sender has a shared interest with the recipient. It can be lost through overpublication, malice, or reliance on rumors.
FYI, this doesn’t actually work. https://www.virginiadefamationlawyer.com/implied-undisclosed-facts-as-basis-for-defamation-claim/
Damn. Okay, what about “person X is banned from our activities, we do not explain why”?
You’re probably safe so long as you restrict distribution to the minimum group with an interest. There is conditional privilege if the sender has a shared interest with the recipient. It can be lost through overpublication, malice, or reliance on rumors.