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If you mainly want to “hide” your IP, you can’t. Look at the headers of any message. It’ll still show the original source IP, which will be yours.
For the rest of the time I’d recommend getting a spam filtering service. Mimecast, ProofPoint, Barracuda, etc.
Messages sent to you go to the filter, which then forwards the message over to your mail server. Outbound you configure your server to use the filter as a smart host. These filters will also buffer messages if your mail server is offline. So if the server is down, the filter holds on to messages and retries delivery later when your server is back up (within reason).
I just switched from using Medusa and CouchPotato to Sonarr and Radarr. During the library import process, you can specify if the application should “monitor” the media which is what it means to download new content or try and replace with higher qualities. You can import entire libraries as “Unmonitored” so it will show it, but effectively ignore it unless you go back and change it. You can also just not import your library, and start “clean” if you wanted, and I believe it will just ignore the files for anything you don’t add.