diff --git a/config/application.yml.sample b/config/application.yml.sample
index cbe32e5db..b7d4c2c3b 100644
--- a/config/application.yml.sample
+++ b/config/application.yml.sample
@@ -163,6 +163,9 @@ tara_secret: 'secret'
 tara_redirect_uri: 'redirect_url'
 tara_keys: "{\"kty\":\"RSA\",\"kid\":\"de6cc4\",\"n\":\"jWwAjT_03ypme9ZWeSe7c-jY26NO50Wo5I1LBnPW2JLc0dPMj8v7y4ehiRpClYNTaSWcLd4DJmlKXDXXudEUWwXa7TtjBFJfzlZ-1u0tDvJ-H9zv9MzO7UhUFytztUEMTrtStdhGbzkzdEZZCgFYeo2i33eXxzIR1nGvI05d9Y-e_LHnNE2ZKTa89BC7ZiCXq5nfAaCgQna_knh4kFAX-KgiPRAtsiDHcAWKcBY3qUVcb-5XAX8p668MlGLukzsh5tFkQCbJVyNtmlbIHdbGvVHPb8C0H3oLYciv1Fjy_tS1lO7OT_cb3GVp6Ql-CG0uED_8pkpVtfsGRviub4_ElQ\",\"e\":\"AQAB\"}"
 
+# 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