Mailcow tunnel setup

KilakOriginal

Hi!

I have a NAS at home running dockerised mailcow. It’s connected to a VPS with a public IPv4 address via a reverse SSH tunnel. The setup works fine for the most part, however mailcow thinks it’s IP address is the local address rather than the VPS’ public address. Here’s the tunnel setup, so we’re all on the same page:

[Unit]
Description=Reverse SSH Tunnel for Privileged Mail Ports to VPS (as root)
After=network-online.target
Wants=network-online.target

[Service]
User=malik
Environment=HOME=/home/malik
ExecStart=/usr/bin/autossh -M 0 -N \
  -o "ServerAliveInterval=60" -o "ServerAliveCountMax=3" \
  -i /home/malik/.ssh/vps_autossh \
  -R 127.0.0.1:25:localhost:25 \
  -R 127.0.0.1:465:localhost:465 \
  -R 127.0.0.1:587:localhost:587 \
  -R 127.0.0.1:143:localhost:143 \
  -R 127.0.0.1:993:localhost:993 \
  -R 127.0.0.1:110:localhost:110 \
  -R 127.0.0.1:995:localhost:995 \
  -R 127.0.0.1:4190:localhost:4190 \
  root@212.227.63.142
Restart=always
RestartSec=10

[Install]
WantedBy=multi-user.target

Any ideas on how to fix this?

ETNyx

Hi, I do not think you can solve this using just reverse SSH tunnel,..

Think those are viable options for you:
1) Wireguard VPN + NAT
2) Proxy server
3) SMTP relay

KilakOriginal

ETNyx I suppose option 3) sounds like a good idea if all else fails, especially when considering deliverability. I’ve tried replacing the reverse SSH tunnel with wireguard already but that didn’t help. Maybe it set it up incorrectly?