diff --git a/app/models/user.rb b/app/models/user.rb
index 06b06166c..252208c09 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -149,6 +149,7 @@ class User < ApplicationRecord
   scope :deleted, -> { where("name ~ 'user_[0-9]+~*'") }
   scope :undeleted, -> { where("name !~ 'user_[0-9]+~*'") }
   scope :admins, -> { where(level: Levels::ADMIN) }
+  scope :banned, -> { bit_prefs_match(:is_banned, true) }
 
   scope :has_blacklisted_tag, ->(name) { where_regex(:blacklisted_tags, "(^| )[~-]?#{Regexp.escape(name)}( |$)", flags: "ni") }
   scope :has_private_favorites, -> { bit_prefs_match(:enable_private_favorites, true) }
diff --git a/script/fixes/118_fix_duplicate_emails.rb b/script/fixes/118_fix_duplicate_emails.rb
new file mode 100755
index 000000000..904995990
--- /dev/null
+++ b/script/fixes/118_fix_duplicate_emails.rb
@@ -0,0 +1,91 @@
+#!/usr/bin/env ruby
+
+require_relative "base"
+
+# delete fake emails
+with_confirmation do
+  fake_emails = %w[
+    a@a.com
+    a@b.com
+    a@aa.com
+    a@outlook.com
+    a@yahoo.com
+    a@gmail.com
+    a@naver.com
+    1@1.com
+    1@yahoo.com
+    222@222.com
+    aa@bb.com
+    aa@gmail.com
+    aaa@aa.com
+    aaa@gmail.com
+    aaa@yahoo.com
+    aaa@outlook.com
+    aaaa@outlook.com
+    aaaaa@yahoo.com
+    aaaaa@outlook.com
+    aaaaaa@gmail.com
+    abc@gmail.com
+    abc@outlook.com
+    abc@yahoo.com
+    ass@ass.com
+    asd@yahoo.com
+    asdf@gmail.com
+    asdf@yahoo.com
+    abcd@yahoo.com
+    lol@outlook.com
+    bob@gmail.com
+    dan@gmail.com
+    john@yahoo.com
+    danbooru@outlook.com
+    123456789@qq.com
+    asd@asd.asd
+    asdf@asdf.com
+    no@no.no
+    test@example.com
+  ]
+
+  emails = EmailAddress.where(normalized_address: fake_emails)
+
+  emails.each do |email|
+    puts "DELETE #{email.address} (#{email.user.name}##{email.user.id})"
+    email.destroy if ENV.fetch("DELETE", "false").truthy?
+  end
+end
+
+# delete dupe emails belonging to banned users
+with_confirmation do
+  emails = EmailAddress.where(user: User.banned).where(normalized_address: EmailAddress.group(:normalized_address).having("COUNT(*) > 1").select(:normalized_address))
+
+  emails.each do |email|
+    puts "DELETE #{email.address} (#{email.user.name}##{email.user.id})"
+    email.destroy if ENV.fetch("DELETE", "false").truthy?
+  end
+end
+
+# delete dupe emails, keeping the email belonging to the account that visited the site most recently.
+with_confirmation do
+  emails = EmailAddress.group(:normalized_address).having("COUNT(*) > 1").select(:normalized_address, "array_agg(id) AS ids").order(Arel.sql("COUNT(*) DESC, normalized_address"))
+
+  emails.each do |email|
+    dupe_emails = EmailAddress.where(id: email.ids).joins(:user).to_a
+
+    dupe_emails.sort_by! { |dupe_email| [-dupe_email.user.last_logged_in_at.to_i, -dupe_email.user.id] }
+    dupe_emails => [keep, *dupes]
+
+    puts "#{"#{keep.address} (#{keep.user.name}##{keep.user.id})".ljust(60, " ")} DELETE #{dupes.map { |dupe| "#{dupe.address} (#{dupe.user.name}##{dupe.user.id})" }.join(" ")}"
+    dupes.each(&:destroy) if ENV.fetch("DELETE", "false").truthy?
+  end
+
+  emails = EmailAddress.group(:address).having("COUNT(*) > 1").select(:address, "array_agg(id) AS ids").order(Arel.sql("COUNT(*) DESC, address"))
+
+  emails.each do |email|
+    dupe_emails = EmailAddress.where(id: email.ids).joins(:user).to_a
+
+    dupe_emails.sort_by! { |dupe_email| [-dupe_email.user.last_logged_in_at.to_i, -dupe_email.user.id] }
+    dupe_emails => [keep, *dupes]
+
+    puts "#{"#{keep.address} (#{keep.user.name}##{keep.user.id})".ljust(60, " ")} DELETE #{dupes.map { |dupe| "#{dupe.address} (#{dupe.user.name}##{dupe.user.id})" }.join(" ")}"
+    dupes.each(&:destroy) if ENV.fetch("DELETE", "false").truthy?
+  end
+end