Swoosh isn't working straight from hexdocs

MUSTDOS

I was following this for sending Gmails from Phoenix whenever someone registers an account.

I modified my user controller to this

def create(conn, %{"_action" => "registered" , "user" => user_params} = params) do 
  Swoosh.Email.new() 
  |> Swoosh.Email.to({nil ,user_params["email"]}) 
  |> Swoosh.Email.from({"outsider", "outsideemail@home.here"}) 
  |> Swoosh.Email.subject("FINALLY!") 
  |> Swoosh.Email.html_body("<h1>FINALLY!</h1>") 
  |> Swoosh.Email.text_body("FINALLY!\n") 
  |> Pento.Mailer.deliver() 

  create(conn, params, "Account created successfully!") 
end

And my config/runtime.exs (for I got a warning from console that it’s better to place it there than config/config.exs)

config :pento, Pento.Mailer, 
  adapter: Swoosh.Adapters.Gmail, 
  access_token: {:system, "gmail-api-access-token-from-playground"}

I don’t get an email but I get this error

from console

[error] GenServer #PID<0.658.0> terminating
** (stop) :econnaborted
Last message: {:tcp_error, #Port<0.22>, :econnaborted}
State: {%ThousandIsland.Socket{socket: #Port<0.22>, transport_module: ThousandIsland.Transports.TCP, read_timeout: 60000, silent_terminate_on_error: false, span: %ThousandIsland.Telemetry{span_name: :connection, telemetry_span_context: #Reference<0.2682427495.2491154433.212811>, start_time: -8253868621053248, start_metadata: %{handler: Bandit.DelegatingHandler, remote_port: 55554, remote_address: {127, 0, 0, 1}, telemetry_span_context: #Reference<0.2682427495.2491154433.212811>, parent_telemetry_span_context: #Reference<0.2682427495.2491154435.210270>}}}, %{opts: %{http: [ ], websocket: `[ ]`, http_1: [ ], http_2: [ ]}, plug: {Phoenix.Endpoint.SyncCodeReloadPlug, {PentoWeb.Endpoint, [ ]}}, handler_module: Bandit.HTTP1.Handler, http_1_enabled: true, http_2_enabled: true, requests_processed: 40}}

6 comments

/phoenix #troubleshooting #swoosh

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2025-08-26 21:41:24 UTC

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jswanner

This is equivalent to System.get_env("gmail-api-access-token-from-playground"), do you have an environment variable by that name?

Post #1

LostKobrakai

Generally system tuples are a thing of the past though.

You’d much rather use `System.get_env` calls directly in runtime.exs nowadays.

Post #2

MUSTDOS

The "gmail-api-access-token-from-playground"

is taken from here in step 2 OAuth 2.0 Playground after clicking “Exchange authorization code for tokens“

Post #3

jswanner

I think what you want is:

access_token: "gmail-api-access-token-from-playground"

Next step is to create a environment variable and then use it:

GMAIL_API_ACCESS_TOKEN=gmail-api-access-token-from-playground

access_token: System.get_env("GMAIL_API_ACCESS_TOKEN")

Post #4

MUSTDOS

I had to lower case gmail_api_access_token to get it to save rather than raising an invalid match and it still doesn’t deliver

Post #5

jswanner

Environment variables are set in your shell (or whatever is starting elixir). It’s more of a deployment/security concern, if you are just getting started you can hard code the API key, just don’t push the code to a public repository

Post #6

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