Add smtp email provider options and related settings. (#585)

Gemfile.lock

@@ -492,6 +492,7 @@ PLATFORMS
   arm64-darwin-23
   arm64-darwin-24
   x86_64-darwin-22
+  x86_64-darwin-23
   x86_64-linux
 
 DEPENDENCIES

config/initializers/email_feature.rb

@@ -1,6 +1,7 @@
 module Email
   class Providers
     POSTMARK = "postmark".freeze
+    SMTP = "smtp".freeze
 
     class << self
       def all
@@ -27,11 +28,23 @@ class PasswordReset
       abort "ERROR: The value of EMAIL_PROVIDER must be one of: #{Email::Providers.all.join(", ")}"
     end
 
-    if Setting.email_provider == Email::Providers::POSTMARK
+    case Setting.email_provider
+    when Email::Providers::POSTMARK
       Setting.require_keys!(:postmark_server_api_token)
 
       config.action_mailer.delivery_method = :postmark
       config.action_mailer.postmark_settings = { api_token: Setting.postmark_server_api_token }
+    when Email::Providers::SMTP
+      Setting.require_keys!(:smtp_address, :smtp_user_name, :smtp_password)
+      config.action_mailer.delivery_method = :smtp
+      config.action_mailer.smtp_settings = {
+        address: Setting.smtp_address,
+        port: Setting.smtp_port.to_i,
+        user_name: Setting.smtp_user_name,
+        password: Setting.smtp_password,
+        authentication: Setting.smtp_authentication,
+        enable_starttls_auto: Setting.smtp_enable_starttls_auto.to_b
+      }
     end
   end
 end

config/options.yml

@@ -71,3 +71,9 @@ shared:
     email_from: <%= ENV["EMAIL_FROM"] || default_to(:email_from, except_env_test: "support@example.com") %>
     email_host: <%= ENV["EMAIL_HOST"] || default_to(:email_host, except_env_test: "example.com")  %>
     postmark_server_api_token: <%= ENV["POSTMARK_SERVER_API_TOKEN"] || default_to(:postmark_server_api_token, except_env_test: "test-token") %>
+    smtp_address: <%= ENV["SMTP_ADDRESS"] || default_to(:smtp_address) %>
+    smtp_port: <%= ENV["SMTP_PORT"] || default_to(:smtp_port) || 587 %>
+    smtp_user_name: <%= ENV["SMTP_USER_NAME"] || default_to(:smtp_user_name) %>
+    smtp_password: <%= ENV["SMTP_PASSWORD"] || default_to(:smtp_password) %>
+    smtp_authentication: <%= ENV["SMTP_AUTHENTICATION"] || default_to(:smtp_authentication) || "plain" %>
+    smtp_enable_starttls_auto: <%= ENV["SMTP_ENABLE_STARTTLS_AUTO"] || default_to(:smtp_enable_starttls_auto) || true %>