fix: remove undefined function

config/runtime.exs

@@ -106,7 +106,7 @@ if config_env() == :prod do
     username: System.get_env("SMTP_USERNAME"),
     password: System.get_env("SMTP_PASSWORD"),
     ssl: System.get_env("SMTP_SSL") == "true",
-    tls: Comfycamp.Config.get_smtp_tls_config(),
+    tls: :if_available,
     auth: :always,
     port: Integer.parse(System.get_env("SMTP_PORT") || "465")
 
@@ -117,13 +117,3 @@ if config_env() == :prod do
   #
   # See https://hexdocs.pm/swoosh/Swoosh.html#module-installation for details.
 end
-
-defmodule Comfycamp.Config do
-  def get_smtp_tls_config() do
-    case System.get_env("SMTP_TLS") do
-      "always" -> :always
-      "never" -> :never
-      _ -> :if_available
-    end
-  end
-end