diff --git a/lib/mastodon/cli/email_domain_blocks.rb b/lib/mastodon/cli/email_domain_blocks.rb
index 7b2da8ef9f..a830ca3661 100644
--- a/lib/mastodon/cli/email_domain_blocks.rb
+++ b/lib/mastodon/cli/email_domain_blocks.rb
@@ -48,7 +48,7 @@ module Mastodon::CLI
         if options[:with_dns_records]
           Resolv::DNS.open do |dns|
             dns.timeouts = 5
-            other_domains = dns.getresources(@email_domain_block.domain, Resolv::DNS::Resource::IN::MX).to_a
+            other_domains = dns.getresources(domain, Resolv::DNS::Resource::IN::MX).to_a.map { |e| e.exchange.to_s }.compact_blank
           end
         end
 
diff --git a/spec/lib/mastodon/cli/email_domain_blocks_spec.rb b/spec/lib/mastodon/cli/email_domain_blocks_spec.rb
index a5fbd23e65..6ce1a7c5f3 100644
--- a/spec/lib/mastodon/cli/email_domain_blocks_spec.rb
+++ b/spec/lib/mastodon/cli/email_domain_blocks_spec.rb
@@ -63,6 +63,22 @@ RSpec.describe Mastodon::CLI::EmailDomainBlocks do
           .and(change(EmailDomainBlock, :count).by(1))
       end
     end
+
+    context 'with --with-dns-records true' do
+      let(:domain) { 'host.example' }
+      let(:arguments) { [domain] }
+      let(:options) { { with_dns_records: true } }
+
+      before do
+        configure_mx(domain: domain, exchange: 'other.host')
+      end
+
+      it 'adds a new block for parent and children' do
+        expect { subject }
+          .to output_results('Added 2')
+          .and(change(EmailDomainBlock, :count).by(2))
+      end
+    end
   end
 
   describe '#remove' do