diff --git a/app/mailers/invite_mailer.rb b/app/mailers/invite_mailer.rb
index daf01ec0c75..035dadb3b45 100644
--- a/app/mailers/invite_mailer.rb
+++ b/app/mailers/invite_mailer.rb
@@ -7,14 +7,14 @@ class InviteMailer < ActionMailer::Base
     # Find the first topic they were invited to
     first_topic = invite.topics.order(:created_at).first
 
+    # get invitee name (based on site setting)
+    invitee_name = invite.invited_by.username
+    if (SiteSetting.enable_names)
+      invitee_name = "#{invite.invited_by.name} (#{invite.invited_by.username})"
+    end
+
     # If they were invited to a topic
     if first_topic.present?
-      # get invitee name (based on site setting)
-      invitee_name = invite.invited_by.username
-      if (SiteSetting.enable_names)
-        invitee_name = "#{invite.invited_by.name} (#{invite.invited_by.username})"
-      end
-
       # get topic excerpt
       topic_excerpt = ""
       if first_topic.excerpt
@@ -33,7 +33,8 @@ class InviteMailer < ActionMailer::Base
     else
       build_email(invite.email,
                   template: 'invite_forum_mailer',
-                  invitee_name: invite.invited_by.username,
+                  invitee_name: invitee_name,
+                  site_domain_name: Discourse.current_hostname,
                   invite_link: "#{Discourse.base_url}/invites/#{invite.invite_key}",
                   site_description: SiteSetting.site_description,
                   site_title: SiteSetting.title)
diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index 6cb4cbd2610..3aa3bececff 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -1067,7 +1067,7 @@ en:
       This invitation is from a trusted user, so you can reply to the discussion immediately.
 
   invite_forum_mailer:
-    subject_template: "%{invitee_name} invited you to join %{site_name}"
+    subject_template: "%{invitee_name} invited you to join %{site_domain_name}"
     text_body_template: |
       %{invitee_name} invited you to join
 
diff --git a/spec/mailers/invite_mailer_spec.rb b/spec/mailers/invite_mailer_spec.rb
index 6c0fa6d0e97..99695ea05ee 100644
--- a/spec/mailers/invite_mailer_spec.rb
+++ b/spec/mailers/invite_mailer_spec.rb
@@ -16,6 +16,10 @@ describe InviteMailer do
         expect(invite_mail.subject).to be_present
       end
 
+      it 'renders site domain name in subject' do
+        expect(invite_mail.subject).to match(Discourse.current_hostname)
+      end
+
       it 'renders the body' do
         expect(invite_mail.body).to be_present
       end