Previously, the tests would listen on all available interfaces.
Instead, have the tests use localhost only; using all available
interfaces is unnecessary.
On Mac OS X with the builtin firewall enabled, it triggers annoying
prompts to allow the tests to listen on all interfaces.
- Cut back to bare minimum to make the rest simpler
- Consistency in config naming
- Have one data strucutre that's the same for all templates
- Pass in common labels to templates
- Support templates almost everywhere
- Support multiple SMTP recipients
- Support non-ASCII SMTP headers
- Handle colour logic via templates
- Make $subjects have consistent output, go maps aren't sorted.
- Make tests pass when v6 is disabled