Fix bamboo smtp network error by forwarding tls options

config/runtime.exs

@@ -174,8 +174,7 @@ cond do
 
   get_env("SMTP_ADDRESS") ->
     config :accent, Accent.Mailer,
-      tls: :never,
-      adapter: Bamboo.SMTPAdapter,
+      adapter: BambooSMTPAdapterWithTlsOptions,
       server: get_env("SMTP_ADDRESS"),
       port: get_env("SMTP_PORT"),
       username: get_env("SMTP_USERNAME"),

lib/accent.ex

@@ -20,6 +20,10 @@ defmodule Accent do
       {:ok, _} = Logger.add_backend(Sentry.LoggerBackend)
     end
 
+    if Application.get_env(:accent, Accent.Mailer)[:adapter] === BambooSMTPAdapterWithTlsOptions do
+      add_tls_options_to_mailer_smtp_adapter()
+    end
+
     Ecto.DevLogger.install(Accent.Repo,
       ignore_event: fn metadata ->
         not is_nil(metadata[:options][:telemetry_ui_conf])
@@ -35,6 +39,12 @@ defmodule Accent do
     :ok
   end
 
+  defp add_tls_options_to_mailer_smtp_adapter do
+    config = Application.get_env(:accent, Accent.Mailer)
+    new_config = Keyword.put(config, :tls_options, :tls_certificate_check.options(config[:server]))
+    Application.put_env(:accent, Accent.Mailer, new_config)
+  end
+
   defp language_tool_config do
     [
       languages: Application.get_env(:accent, LanguageTool)[:languages],

mix.exs

@@ -97,6 +97,7 @@ defmodule Accent.Mixfile do
 
       # Mails
       {:bamboo, "~> 2.3", override: true},
+      {:tls_certificate_check, "~> 1.21"},
       {:bamboo_phoenix, "~> 1.0"},
       {:bamboo_smtp, "~> 4.2"},
 

mix.lock

@@ -95,6 +95,7 @@
   "tesla": {:hex, :tesla, "1.8.0", "d511a4f5c5e42538d97eef7c40ec4f3e44effdc5068206f42ed859e09e51d1fd", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:exjsx, ">= 3.0.0", [hex: :exjsx, repo: "hexpm", optional: true]}, {:finch, "~> 0.13", [hex: :finch, repo: "hexpm", optional: true]}, {:fuse, "~> 2.4", [hex: :fuse, repo: "hexpm", optional: true]}, {:gun, ">= 1.0.0", [hex: :gun, repo: "hexpm", optional: true]}, {:hackney, "~> 1.6", [hex: :hackney, repo: "hexpm", optional: true]}, {:ibrowse, "4.4.2", [hex: :ibrowse, repo: "hexpm", optional: true]}, {:jason, ">= 1.0.0", [hex: :jason, repo: "hexpm", optional: true]}, {:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:mint, "~> 1.0", [hex: :mint, repo: "hexpm", optional: true]}, {:msgpax, "~> 2.3", [hex: :msgpax, repo: "hexpm", optional: true]}, {:poison, ">= 1.0.0", [hex: :poison, repo: "hexpm", optional: true]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: true]}], "hexpm", "10501f360cd926a309501287470372af1a6e1cbed0f43949203a4c13300bc79f"},
   "thousand_island": {:hex, :thousand_island, "1.2.0", "4f548ae771ab5f96bc7e199f9824c0c2ce6d365f8c93f5f64dbbb33988e484bf", [:mix], [{:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "521671fea179672addb6af46455fc2a77be1edda4c0ed351633e0ef37a4b3584"},
   "timex": {:hex, :timex, "3.7.11", "bb95cb4eb1d06e27346325de506bcc6c30f9c6dea40d1ebe390b262fad1862d1", [:mix], [{:combine, "~> 0.10", [hex: :combine, repo: "hexpm", optional: false]}, {:gettext, "~> 0.20", [hex: :gettext, repo: "hexpm", optional: false]}, {:tzdata, "~> 1.1", [hex: :tzdata, repo: "hexpm", optional: false]}], "hexpm", "8b9024f7efbabaf9bd7aa04f65cf8dcd7c9818ca5737677c7b76acbc6a94d1aa"},
+  "tls_certificate_check": {:hex, :tls_certificate_check, "1.21.0", "042ab2c0c860652bc5cf69c94e3a31f96676d14682e22ec7813bd173ceff1788", [:rebar3], [{:ssl_verify_fun, "~> 1.1", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm", "6cee6cffc35a390840d48d463541d50746a7b0e421acaadb833cfc7961e490e7"},
   "tzdata": {:hex, :tzdata, "1.1.1", "20c8043476dfda8504952d00adac41c6eda23912278add38edc140ae0c5bcc46", [:mix], [{:hackney, "~> 1.17", [hex: :hackney, repo: "hexpm", optional: false]}], "hexpm", "a69cec8352eafcd2e198dea28a34113b60fdc6cb57eb5ad65c10292a6ba89787"},
   "ueberauth": {:hex, :ueberauth, "0.10.5", "806adb703df87e55b5615cf365e809f84c20c68aa8c08ff8a416a5a6644c4b02", [:mix], [{:plug, "~> 1.5", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "3efd1f31d490a125c7ed453b926f7c31d78b97b8a854c755f5c40064bf3ac9e1"},
   "ueberauth_auth0": {:hex, :ueberauth_auth0, "2.1.0", "0632d5844049fa2f26823f15e1120aa32f27df6f27ce515a4b04641736594bf4", [:mix], [{:oauth2, "~> 2.0", [hex: :oauth2, repo: "hexpm", optional: false]}, {:ueberauth, "~> 0.7", [hex: :ueberauth, repo: "hexpm", optional: false]}], "hexpm", "8d3b30fa27c95c9e82c30c4afb016251405706d2e9627e603c3c9787fd1314fc"},