diff --git a/config/application.yml.sample b/config/application.yml.sample
index acc5ab6b4..5a92443c4 100644
--- a/config/application.yml.sample
+++ b/config/application.yml.sample
@@ -182,6 +182,9 @@ tara_rant_secret: 'secret'
 tara_rant_redirect_uri: 'redirect_uri'
 
 default_email_validation_type: 'mx'
+# You can predefine regex only validation for domains (i.e. 'somedomain.com, otherdomain.com'):
+regex_only_email_validations: ''
+
 default_connection_timeout: '1'
 default_response_timeout: '1'
 
diff --git a/config/initializers/truemail.rb b/config/initializers/truemail.rb
index fd5a803ca..7a6a2256c 100644
--- a/config/initializers/truemail.rb
+++ b/config/initializers/truemail.rb
@@ -48,6 +48,9 @@ Truemail.configure do |config|
   # And all of validations for 'otherdomain.com' will be processed with mx validation only.
   # It is equal to empty hash by default.
   # config.validation_type_for = { 'somedomain.com' => :regex, 'otherdomain.com' => :mx }
+  config.validation_type_for = ENV['regex_only_email_validations'].split(/,/)
+                                                                  .collect { |d| [d.strip, :regex] }
+                                                                  .to_h
 
   # Optional parameter. Validation of email which contains whitelisted domain always will
   # return true. Other validations will not processed even if it was defined in validation_type_for