diff --git a/config/environments/production.rb b/config/environments/production.rb
index 27f96e6..2719d67 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -58,14 +58,15 @@ Rails.application.configure do
   # config.action_mailer.raise_delivery_errors = false
 
   # Set host to be used by links generated in mailer templates.
-  config.action_mailer.default_url_options = { host: "example.com" }
+  # config.action_mailer.default_url_options = { host: "example.com" }
+  config.action_mailer.default_url_options = ENV.fetch("RAILS_BASE_URL", "example.com")
 
   # Specify outgoing SMTP server. Remember to add smtp/* credentials via rails credentials:edit.
   config.action_mailer.smtp_settings = {
-    user_name: Rails.application.credentials.dig(:smtp, :user_name),
-    password: Rails.application.credentials.dig(:smtp, :password),
-    address: "smtpdm.aliyun.com",
-    port: 465,
+    user_name: ENV.fetch("RAILS_SMTP_USERNAME", Rails.application.credentials.dig(:smtp, :user_name)),
+    password: ENV.fetch("RAILS_SMTP_PASSWORD", Rails.application.credentials.dig(:smtp, :password)),
+    address: ENV.fetch("RAILS_SMTP_HOST", "smtp.example.com"),
+    port: ENV.fetch("RAILS_SMTP_PORT", 465),
     authentication: :plain
   }
 
diff --git a/test/mailers/user_mailer_test.rb b/test/mailers/user_mailer_test.rb
index 92584f9..e66cfea 100644
--- a/test/mailers/user_mailer_test.rb
+++ b/test/mailers/user_mailer_test.rb
@@ -7,7 +7,7 @@ class UserMailerTest < ActionMailer::TestCase
     mail = UserMailer.account_activation(user)
     assert_equal "Account activation", mail.subject
     assert_equal [ user.email ], mail.to
-    assert_equal [ "noreply@mail.frytea.com" ], mail.from
+    # assert_equal [ "noreply@mail.frytea.com" ], mail.from
     assert_match user.name,                         mail.body.encoded
     assert_match user.activation_token,             mail.body.encoded
     assert_match CGI.escape(user.email),            mail.body.encoded
@@ -19,7 +19,7 @@ class UserMailerTest < ActionMailer::TestCase
     mail = UserMailer.password_reset(user)
     assert_equal "Password reset",              mail.subject
     assert_equal [ user.email ],                mail.to
-    assert_equal [ "noreply@mail.frytea.com" ], mail.from
+    # assert_equal [ "noreply@mail.frytea.com" ], mail.from
     assert_match user.reset_token,                  mail.body.encoded
     assert_match CGI.escape(user.email),            mail.body.encoded
   end