3 files changed, 48 insertions, 6 deletions
diff --git a/app/mailers/devise_mailer.rb b/app/mailers/devise_mailer.rb
index cbaf53fced1..a02670aed90 100644
--- a/app/mailers/devise_mailer.rb
+++ b/app/mailers/devise_mailer.rb
@@ -9,6 +9,10 @@ class DeviseMailer < Devise::Mailer
   helper EmailsHelper
   helper ApplicationHelper
 
+  def password_change_by_admin(record, opts = {})
+    devise_mail(record, :password_change_by_admin, opts)
+  end
+
   protected
 
   def subject_for(key)
diff --git a/app/mailers/emails/members.rb b/app/mailers/emails/members.rb
index 07ce9bba784..3a13c5949bd 100644
--- a/app/mailers/emails/members.rb
+++ b/app/mailers/emails/members.rb
@@ -51,9 +51,32 @@ module Emails
 
       return unless member_exists?
 
-      member_email_with_layout(
-        to: member.invite_email,
-        subject: subject("Invitation to join the #{member_source.human_name} #{member_source.model_name.singular}"))
+      subject_line = subject("Invitation to join the #{member_source.human_name} #{member_source.model_name.singular}")
+
+      if member.invite_to_unknown_user? && Feature.enabled?(:invite_email_experiment)
+        subject_line = subject("#{member.created_by.name} invited you to join GitLab") if member.created_by
+        @invite_url_params = { new_user_invite: 'experiment' }
+
+        member_email_with_layout(
+          to: member.invite_email,
+          subject: subject_line,
+          template: 'member_invited_email_experiment',
+          layout: 'experiment_mailer'
+        )
+
+        Gitlab::Tracking.event(Gitlab::Experimentation::EXPERIMENTS[:invite_email][:tracking_category], 'sent', property: 'experiment_group')
+      else
+        @invite_url_params = member.invite_to_unknown_user? ? { new_user_invite: 'control' } : {}
+
+        member_email_with_layout(
+          to: member.invite_email,
+          subject: subject_line
+        )
+
+        if member.invite_to_unknown_user?
+          Gitlab::Tracking.event(Gitlab::Experimentation::EXPERIMENTS[:invite_email][:tracking_category], 'sent', property: 'control_group')
+        end
+      end
     end
 
     def member_invite_accepted_email(member_source_type, member_id)
@@ -107,10 +130,15 @@ module Emails
       @member_source_type.classify.constantize
     end
 
-    def member_email_with_layout(to:, subject:)
+    def member_email_with_layout(to:, subject:, template: nil, layout: 'mailer')
       mail(to: to, subject: subject) do |format|
-        format.html { render layout: 'mailer' }
-        format.text { render layout: 'mailer' }
+        if template
+          format.html { render template, layout: layout }
+          format.text { render template, layout: layout }
+        else
+          format.html { render layout: layout }
+          format.text { render layout: layout }
+        end
       end
     end
   end
diff --git a/app/mailers/emails/profile.rb b/app/mailers/emails/profile.rb
index b45755788b8..96cf3571968 100644
--- a/app/mailers/emails/profile.rb
+++ b/app/mailers/emails/profile.rb
@@ -72,6 +72,16 @@ module Emails
         end
       end
     end
+
+    def disabled_two_factor_email(user)
+      return unless user
+
+      @user = user
+
+      Gitlab::I18n.with_locale(@user.preferred_language) do
+        mail(to: @user.notification_email, subject: subject(_("Two-factor authentication disabled")))
+      end
+    end
   end
 end