Error sending email using mailgun adapters with swoosh

Can you show your code?

Hello sir, sorry for the late response. Here are my codes..

# config/config.exs
config :swoosh, :api_client, Swoosh.ApiClient.Hackney

config :hello, Hello.Mailer,
  adapter: Swoosh.Adapters.Mailgun,
  api_key: "my-api-key",
  domain: "domain-here"
  
  
# lib/hello/mailer.ex
defmodule Hello.Mailer do
  use Swoosh.Mailer, otp_app: :hello
end


# lib/hello/email.ex
defmodule Hello.Email do
  import Swoosh.Email

  def welcome() do
    new()
    |> to({"John", "john@gmail.com"})
    |> from({"Jake", "jake@gmail.com"})
    |> subject("Hello, World!")
    |> html_body("<h1>Hello World</h1>")
    |> text_body("Hello World\n")
  end
end


# hello_web/controllers/page_controller.ex
alias Hello.{Email, Mailer}

def index(conn, _params) do
    Email.welcome() |> Mailer.deliver()
    render(conn, :index)
end

Just to make sure – did you add hackney to your mix.exs list of dependencies?

Notice that this thread and others linked to it say that you must also add gen_smtp if you use non-SMTP adapter to deliver emails.

Yes sir, i have gen_smtp and hackney dependencies installed.

In dependecy section, it states

" Mailgun adapter requires Plug to work properly."

I don’t know if it just requires to install plug or have to create some function plugs (and i dont know what to write in those plugs) to work