Inbound 1.x
Backup-MX / forwarder. Accepts on port 25 only for listed domains. Recipients are either an allow-list or any address at that domain. Off by default in Compose.
Add inbound domain
Forwarding
| Domain | DNS | Upstream | Recipients | TLS | |
|---|---|---|---|---|---|
| lists.example.com | ok | 10.0.0.8:25 | 12 listed | required | Delete |
| backup.example.net | error | 192.0.2.20:25 | any | off | Delete |
The DNS badge is the MX check: at least one MX must point at this server. Results are cached for a few minutes; open a domain for the lookup and a Re-check button.