Hi all,
I need to receive some advices regarding the configuration of QNAP Xeams package with 365 EOL services.

I want to use an internal SMTP server for unauthenticated 25 requests, and I've successfully configured the closed relay from known hosts.

Unfortunately, I receive random forgery alerts even if the messages will be successfully delivered without any kind of spam filtering (SPF OK), do you have any advices?

I've noticed that if I configure my domain in the Domain Page the emails will not be delivered, I need to keep the page blank in order to receive.

Thanks