# 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.

## Forwarding

Add inbound domain

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

- lists.example.comok12 listed · 10.0.0.8:25
- backup.example.neterrorany recipient · 192.0.2.20:25

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.