Update Mailgun.deliver to return ok/error tuples #573
Merged
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Requires: #571
What changed?
Updates Mailgin.deliver function to return ok/error tuples to abide by the new api.
Note on raising configuration errors
We do not change the raising of errors when they deal with configuration options. Those errors are categorically different. We want to return ok/error tuples when there's an error building/delivering email. If a user of Bamboo is missing a configuration variable, it seems important to raise an error.