diff --git a/spec/mailers/admin_mailer_spec.rb b/spec/mailers/admin_mailer_spec.rb
index a4bf9dd66..6d11758ad 100644
--- a/spec/mailers/admin_mailer_spec.rb
+++ b/spec/mailers/admin_mailer_spec.rb
@@ -18,8 +18,8 @@ RSpec.describe AdminMailer do
         .to be_present
         .and(deliver_to(recipient.user_email))
         .and(deliver_from('notifications@localhost'))
-        .and(have_subject("New report for cb6e6126.ngrok.io (##{report.id})"))
-        .and(have_body_text("Mike,\r\n\r\nJohn has reported Mike\r\n\r\nView: https://cb6e6126.ngrok.io/admin/reports/#{report.id}\r\n"))
+        .and(have_subject(I18n.t('admin_mailer.new_report.subject', instance: Rails.configuration.x.local_domain, id: report.id)))
+        .and(have_body_text("Mike,\r\n\r\nJohn has reported Mike\r\n\r\nView: #{admin_report_url(report)}\r\n"))
     end
   end
 
@@ -37,7 +37,7 @@ RSpec.describe AdminMailer do
         .to be_present
         .and(deliver_to(recipient.user_email))
         .and(deliver_from('notifications@localhost'))
-        .and(have_subject("#{appeal.account.username} is appealing a moderation decision on cb6e6126.ngrok.io"))
+        .and(have_subject(I18n.t('admin_mailer.new_appeal.subject', instance: Rails.configuration.x.local_domain, username: appeal.account.username)))
         .and(have_body_text("#{appeal.account.username} is appealing a moderation decision by #{appeal.strike.account.username}"))
     end
   end
@@ -56,7 +56,7 @@ RSpec.describe AdminMailer do
         .to be_present
         .and(deliver_to(recipient.user_email))
         .and(deliver_from('notifications@localhost'))
-        .and(have_subject("New account up for review on cb6e6126.ngrok.io (#{user.account.username})"))
+        .and(have_subject(I18n.t('admin_mailer.new_pending_account.subject', instance: Rails.configuration.x.local_domain, username: user.account.username)))
         .and(have_body_text('The details of the new account are below. You can approve or reject this application.'))
     end
   end
@@ -80,7 +80,7 @@ RSpec.describe AdminMailer do
         .to be_present
         .and(deliver_to(recipient.user_email))
         .and(deliver_from('notifications@localhost'))
-        .and(have_subject('New trends up for review on cb6e6126.ngrok.io'))
+        .and(have_subject(I18n.t('admin_mailer.new_trends.subject', instance: Rails.configuration.x.local_domain)))
         .and(have_body_text('The following items need a review before they can be displayed publicly'))
         .and(have_body_text(ActivityPub::TagManager.instance.url_for(status)))
         .and(have_body_text(link.title))
@@ -101,7 +101,7 @@ RSpec.describe AdminMailer do
         .to be_present
         .and(deliver_to(recipient.user_email))
         .and(deliver_from('notifications@localhost'))
-        .and(have_subject('New Mastodon versions are available for cb6e6126.ngrok.io!'))
+        .and(have_subject(I18n.t('admin_mailer.new_software_updates.subject', instance: Rails.configuration.x.local_domain)))
         .and(have_body_text('New Mastodon versions have been released, you may want to update!'))
     end
   end
@@ -119,7 +119,7 @@ RSpec.describe AdminMailer do
         .to be_present
         .and(deliver_to(recipient.user_email))
         .and(deliver_from('notifications@localhost'))
-        .and(have_subject('Critical Mastodon updates are available for cb6e6126.ngrok.io!'))
+        .and(have_subject(I18n.t('admin_mailer.new_critical_software_updates.subject', instance: Rails.configuration.x.local_domain)))
         .and(have_body_text('New critical versions of Mastodon have been released, you may want to update as soon as possible!'))
         .and(have_header('Importance', 'high'))
         .and(have_header('Priority', 'urgent'))
@@ -140,7 +140,7 @@ RSpec.describe AdminMailer do
         .to be_present
         .and(deliver_to(recipient.user_email))
         .and(deliver_from('notifications@localhost'))
-        .and(have_subject('Registrations for cb6e6126.ngrok.io have been automatically switched to requiring approval'))
+        .and(have_subject(I18n.t('admin_mailer.auto_close_registrations.subject', instance: Rails.configuration.x.local_domain)))
         .and(have_body_text('have been automatically switched'))
     end
   end