I am running Mattermost without nginx in a separate server. But I have a server reverse proxy to this server using nginx.
Here is the output os my docker ps:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0360b2b1a498 mailserver/docker-mailserver:latest "/usr/bin/dumb-init …" 4 days ago Up 47 hours 110/tcp, 0.0.0.0:25->25/tcp, :::25->25/tcp, 0.0.0.0:465->465/tcp, :::465->465/tcp, 143/tcp, 993/tcp, 995/tcp, 0.0.0.0:587->587/tcp, :::587->587/tcp, 4190/tcp mailserver
de81f57deaaa mattermost/mattermost-enterprise-edition:7.4 "/entrypoint.sh matt…" 6 days ago Up 19 hours (healthy) 8067/tcp, 0.0.0.0:8065->8065/tcp, :::8065->8065/tcp, 8074-8075/tcp mattermost_mattermost_1
26853c1c1eaa postgres:13-alpine "docker-entrypoint.s…" 6 days ago Up 19 hours 5432/tcp
I also have a simple mail server for handling the email sending stuff. @agriesser