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Wez Furlong
45993ed1f2
It's easy to typo this and get surprised by the results, so explicitly
check for it and provide a more actionable message than the DNS
resolution error for `cox.` would imply:
```
Entry for domain 'cox' consists of a single DNS label. Domain names in TOML sections need to be quoted like '["cox.com"]` otherwise the '.' will create a nested table rather than being added to the domain name.
error resolving MX for cox: no record found for Query { name: Name("cox."), query_type: A, query_class: IN }. Ignoring the shaping config for that domain.
```