use custom error for better introspection, fix other errors

[ruslandoga]

This should be enough to allow Plausible.Mailer handle/suppress hard bounces.

Maybe with something like this:

defmodule Plausible.SentryFilter do
  # ...
  def before_send(%{original_exception: %Bamboo.PostmarkAdapter.Error{} = e} = event) do
    unless Bamboo.PostmarkAdapter.Error.is_hard_bounce(e), do: event
  end
end

It also fixes invalid (non-text :message) Bamboo.ApiErrors.

Related:

• Log Mailer errors analytics#4885
• https://github.com/beam-community/bamboo/blob/main/lib/bamboo/api_error.ex
• https://sentry.plausible.io/organizations/plausible/issues/756
• https://github.com/plausible/analytics/blob/master/lib/sentry_filter.ex

[ruslandoga]

cc @plausible/oss-developers

[aerosol]

I don't seem to have merge permissions here.

[aerosol]

@ukutaht can you merge?

[ukutaht]

Merged. Also you should have merge permissions now @aerosol