diff --git a/config/application.yml.sample b/config/application.yml.sample
index d5753adb6..478af216f 100644
--- a/config/application.yml.sample
+++ b/config/application.yml.sample
@@ -156,6 +156,9 @@ lhv_dev_mode: 'false'
 
 epp_session_timeout_seconds: '300'
 
+# Email validation setting for Truemail gem. Possible values: 'regex', 'mx', 'smtp'
+default_email_validation_type: 'regex'
+
 # Since the keys for staging are absent from the repo, we need to supply them separate for testing.
 test:
   payments_seb_bank_certificate: 'test/fixtures/files/seb_bank_cert.pem'
diff --git a/config/initializers/truemail.rb b/config/initializers/truemail.rb
index f4517fbc0..badc0cc82 100644
--- a/config/initializers/truemail.rb
+++ b/config/initializers/truemail.rb
@@ -28,7 +28,10 @@ Truemail.configure do |config|
   # Optional parameter. You can predefine default validation type for
   # Truemail.validate('email@email.com') call without with-parameter
   # Available validation types: :regex, :mx, :smtp
-  if Rails.env.production?
+  if ENV['default_email_validation_type'].present? &&
+      %w[regex, mx, smtp].include?(ENV['default_email_validation_type'])
+    config.default_validation_type = ENV['default_email_validation_type'].to_sym
+  elsif Rails.env.production?
     config.default_validation_type = :mx
   else
     config.default_validation_type = :regex