diff --git a/app/models/validation_event.rb b/app/models/validation_event.rb
index 3e76e9bdb..7bce6b987 100644
--- a/app/models/validation_event.rb
+++ b/app/models/validation_event.rb
@@ -6,7 +6,7 @@
 # For email_validation event kind also check_level (regex/mx/smtp) is stored in the event_data
 class ValidationEvent < ApplicationRecord
   enum event_type: ValidationEvent::EventType::TYPES, _suffix: true
-  VALIDATION_PERIOD = 2.years.freeze
+  VALIDATION_PERIOD = 1.year.freeze
   VALID_CHECK_LEVELS = %w[regex mx smtp].freeze
   VALID_EVENTS_COUNT_THRESHOLD = 5
 
diff --git a/lib/tasks/verify_email.rake b/lib/tasks/verify_email.rake
index 7ed26e727..6ec87808b 100644
--- a/lib/tasks/verify_email.rake
+++ b/lib/tasks/verify_email.rake
@@ -61,32 +61,51 @@ def prepare_contacts(options)
     validation_events_ids = ValidationEvent.where('created_at > ?', time).distinct.pluck(:validation_eventable_id)
 
     contacts_ids = Contact.where.not(id: validation_events_ids).pluck(:id)
-    Contact.where(id: contacts_ids + failed_contacts)
+    Contact.where(id: contacts_ids + failed_contacts(options))
   end
 end
 
-def failed_contacts
+def failed_contacts(options)
   failed_contacts = []
   failed_validations_ids = ValidationEvent.failed.pluck(:validation_eventable_id)
   contacts = Contact.where(id: failed_validations_ids).includes(:validation_events)
-  contacts.find_each(batch_size: 1000) do |contact|
+  contacts.find_each(batch_size: 10000) do |contact|
 
-    if contact.validation_events.mx.order(created_at: :asc).present?
-      failed_contacts << contact.id unless contact.validation_events.mx.order(created_at: :asc).last.success
-    end
-
-    if contact.validation_events.regex.order(created_at: :asc).present?
-      failed_contacts << contact.id unless contact.validation_events.regex.order(created_at: :asc).last.success
-    end
-
-    if contact.validation_events.smtp.order(created_at: :asc).present?
-      failed_contacts << contact.id unless contact.validation_events.mx.order(created_at: :asc).last.success
+    case options[:check_level]
+    when 'mx'
+      failed_contacts << unsuccess_mx(contact)
+    when 'regex'
+      failed_contacts << unsuccess_regex(contact)
+    when 'smtp'
+      failed_contacts << unsuccess_smtp(contact)
+    else
+      failed_contacts << unsuccess_mx(contact)
+      failed_contacts << unsuccess_regex(contact)
+      failed_contacts << unsuccess_smtp(contact)
     end
   end
 
   failed_contacts.uniq
 end
 
+def unsuccess_mx(contact)
+  if contact.validation_events.mx.order(created_at: :asc).present?
+    contact.id unless contact.validation_events.mx.order(created_at: :asc).last.success
+  end
+end
+
+def unsuccess_regex(contact)
+  if contact.validation_events.regex.order(created_at: :asc).present?
+    contact.id unless contact.validation_events.regex.order(created_at: :asc).last.success
+  end
+end
+
+def unsuccess_smtp(contact)
+  if contact.validation_events.smtp.order(created_at: :asc).present?
+    contact.id unless contact.validation_events.smtp.order(created_at: :asc).last.success
+  end
+end
+
 def contacts_by_domain(domain_name)
   domain = ::Domain.find_by(name: domain_name)
   return unless domain