run imessage in the background or control it with cli

[bendschs]

I am running my homeserver on a linux device and using puppet-imessage on my osx-desktop device. This setup is working ok so far but it still annoys me, that imessage keeps popping up when i get a new message or send one from riot-client. Is there a way to prevent imessage gui from starting up?
Another, maybe more elegant solution would be to integrate https://textbelt.com as an sms-server directly on the linux-device where the homeserver is hosted and integrate it with synapse. I think that not many people run an osx-server ,so this would probably be a suitable addition to the mac-users running a matrix-homeserver on linux.

cheers
bendsch