diff --git a/app/controllers/admin/email_domain_blocks_controller.rb b/app/controllers/admin/email_domain_blocks_controller.rb
index 12f221164fa..bf6512ca638 100644
--- a/app/controllers/admin/email_domain_blocks_controller.rb
+++ b/app/controllers/admin/email_domain_blocks_controller.rb
@@ -33,17 +33,7 @@ module Admin
       @email_domain_block = EmailDomainBlock.new(resource_params)
 
       if action_from_button == 'save'
-        EmailDomainBlock.transaction do
-          @email_domain_block.save!
-          log_action :create, @email_domain_block
-
-          (@email_domain_block.other_domains || []).uniq.each do |domain|
-            next if EmailDomainBlock.exists?(domain: domain)
-
-            other_email_domain_block = EmailDomainBlock.create!(domain: domain, allow_with_approval: @email_domain_block.allow_with_approval, parent: @email_domain_block)
-            log_action :create, other_email_domain_block
-          end
-        end
+        process_email_domain_block
 
         redirect_to admin_email_domain_blocks_path, notice: I18n.t('admin.email_domain_blocks.created_msg')
       else
@@ -57,6 +47,37 @@ module Admin
 
     private
 
+    def process_email_domain_block
+      EmailDomainBlock.transaction do
+        @email_domain_block.save!
+        log_action :create, @email_domain_block
+        save_other_domains
+      end
+    end
+
+    def save_other_domains
+      other_domains_from_block.each do |domain|
+        next if EmailDomainBlock.exists?(domain: domain)
+
+        log_action :create, block_child_domain(domain)
+      end
+    end
+
+    def block_child_domain(domain)
+      EmailDomainBlock.create!(
+        allow_with_approval: @email_domain_block.allow_with_approval,
+        domain: domain,
+        parent: @email_domain_block
+      )
+    end
+
+    def other_domains_from_block
+      @email_domain_block
+        .other_domains
+        .to_a
+        .uniq
+    end
+
     def set_resolved_records
       @resolved_records = DomainResource.new(@email_domain_block.domain).mx
     end
diff --git a/spec/system/admin/email_domain_blocks_spec.rb b/spec/system/admin/email_domain_blocks_spec.rb
index e88811ac49b..dc08572b0e1 100644
--- a/spec/system/admin/email_domain_blocks_spec.rb
+++ b/spec/system/admin/email_domain_blocks_spec.rb
@@ -8,7 +8,13 @@ RSpec.describe 'Admin::EmailDomainBlocks' do
   before { sign_in current_user }
 
   describe 'Managing email domain blocks' do
-    before { configure_dns(domain: 'example.com', results: []) }
+    before do
+      Fabricate :email_domain_block, domain: 'tester.example'
+      allow(DomainResource)
+        .to receive(:new)
+        .with('example.com')
+        .and_return(instance_double(DomainResource, mx: ['test.example', 'tester.example']))
+    end
 
     let!(:email_domain_block) { Fabricate :email_domain_block }
 
@@ -28,8 +34,12 @@ RSpec.describe 'Admin::EmailDomainBlocks' do
       expect(page)
         .to have_content(I18n.t('admin.email_domain_blocks.new.title'))
 
+      find('input[checked_value="test.example"]').click
+      find('input[checked_value="tester.example"]').click
       expect { submit_create }
         .to change(EmailDomainBlock.where(domain: 'example.com'), :count).by(1)
+        .and change(EmailDomainBlock.where.associated(:parent).where(domain: 'test.example'), :count).by(1)
+        .and not_change(EmailDomainBlock.where.associated(:parent).where(domain: 'tester.example'), :count)
       expect(page)
         .to have_content(I18n.t('admin.email_domain_blocks.title'))
         .and have_content(I18n.t('admin.email_domain_blocks.created_msg'))