Ilia Ross 0cf6654fd9 Fix Postfix localhost destination after hostname domain change ...

- When the system hostname domain changes, update `localhost.<old-domain>` in Postfix `mydestination` to `localhost.<new-domain>`.

- This sits alongside the existing hostname/FQDN updates for Postfix destinations.

Previous behavior:

`save_dns.cgi` only updated Postfix `mydestination` entries that exactly matched:

- the old short hostname, like `host`
- the old FQDN, like `host.old-domain.test`

It did **not** update:

- `localhost.old-domain.test`

So if you changed:

```text
host.old-domain.test
```

to:

```text
host.new-domain.test
```

Postfix could become:

```text
mydestination = host.new-domain.test, host, localhost.old-domain.test
```

After this hunk, it also updates that localhost domain entry:

```text
localhost.old-domain.test
```

to:

```text
localhost.new-domain.test
```

2026-06-20 15:33:22 +02:00

4.2 KiB

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