How to have grafana/prometheus offline notification?

Hello.
is it possible to have prometheus/grafana alert notification offline?
I have a docker compose yaml file that it integrate prometheus alertmanager with grafana to see the ubuntu metrics and docker metrics by node-exporter,loki and …docker images. but i don’t have any access to internet to active email notification or other ways.
how can i have offline email or other approaches notification from prometheus alertmanager?
and how about sms notification?