> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mailchannels.com/llms.txt
> Use this file to discover all available pages before exploring further.

# cPanel Exim: unroutable address error

> Fix the Exim unroutable address error caused by a missing space in the route_list directive.

## Symptom

Exim returns an "unroutable address" error when attempting to relay mail through MailChannels.

## Cause

The error is caused by a missing space in the `route_list` directive in the Exim configuration. Without the space, Exim cannot parse the destination correctly.

## Fix

In WHM's **Exim Advanced Editor**, locate the `send_via_mailchannels` router in the **ROUTERSTART** section and check the `route_list` line.

**Incorrect — missing space:**

```exim theme={null}
route_list = *smtp.mailchannels.net::25 randomize byname
```

**Correct — space between `*` and the hostname:**

```exim theme={null}
route_list = * smtp.mailchannels.net::25 randomize byname
```

The space between `*` and `smtp.mailchannels.net` is required. The `*` means "route all destinations" and must be separated from the smarthost address by a space.

Save the configuration and restart Exim:

```bash theme={null}
/scripts/restartsrv_exim
```