diff --git a/app/controllers/admin/accounts_controller.rb b/app/controllers/admin/accounts_controller.rb
index 948e70d5b5..0786985fac 100644
--- a/app/controllers/admin/accounts_controller.rb
+++ b/app/controllers/admin/accounts_controller.rb
@@ -117,6 +117,16 @@ module Admin
       redirect_to admin_account_path(@account.id), notice: I18n.t('admin.accounts.removed_header_msg', username: @account.acct)
     end
 
+    def unblock_email
+      authorize @account, :unblock_email?
+
+      CanonicalEmailBlock.where(reference_account: @account).delete_all
+
+      log_action :unblock_email, @account
+
+      redirect_to admin_account_path(@account.id), notice: I18n.t('admin.accounts.unblocked_email_msg', username: @account.acct)
+    end
+
     private
 
     def set_account
diff --git a/app/controllers/admin/instances_controller.rb b/app/controllers/admin/instances_controller.rb
index 748c5de5ad..306ec1f532 100644
--- a/app/controllers/admin/instances_controller.rb
+++ b/app/controllers/admin/instances_controller.rb
@@ -14,6 +14,15 @@ module Admin
       authorize :instance, :show?
     end
 
+    def destroy
+      authorize :instance, :destroy?
+
+      Admin::DomainPurgeWorker.perform_async(@instance.domain)
+
+      log_action :destroy, @instance
+      redirect_to admin_instances_path, notice: I18n.t('admin.instances.destroyed_msg', domain: @instance.domain)
+    end
+
     def clear_delivery_errors
       authorize :delivery, :clear_delivery_errors?
 
diff --git a/app/helpers/admin/action_logs_helper.rb b/app/helpers/admin/action_logs_helper.rb
index ae96f7a344..f3aa4be4f2 100644
--- a/app/helpers/admin/action_logs_helper.rb
+++ b/app/helpers/admin/action_logs_helper.rb
@@ -31,6 +31,8 @@ module Admin::ActionLogsHelper
       link_to truncate(record.text), edit_admin_announcement_path(record.id)
     when 'IpBlock'
       "#{record.ip}/#{record.ip.prefix} (#{I18n.t("simple_form.labels.ip_block.severities.#{record.severity}")})"
+    when 'Instance'
+      record.domain
     end
   end
 
@@ -54,6 +56,8 @@ module Admin::ActionLogsHelper
       truncate(attributes['text'].is_a?(Array) ? attributes['text'].last : attributes['text'])
     when 'IpBlock'
       "#{attributes['ip']}/#{attributes['ip'].prefix} (#{I18n.t("simple_form.labels.ip_block.severities.#{attributes['severity']}")})"
+    when 'Instance'
+      attributes['domain']
     end
   end
 end
diff --git a/app/javascript/mastodon/components/admin/Retention.js b/app/javascript/mastodon/components/admin/Retention.js
index aa06722f7e..3a7aaed9d8 100644
--- a/app/javascript/mastodon/components/admin/Retention.js
+++ b/app/javascript/mastodon/components/admin/Retention.js
@@ -42,6 +42,7 @@ export default class Retention extends React.PureComponent {
 
   render () {
     const { loading, data } = this.state;
+    const { frequency } = this.props;
 
     let content;
 
@@ -129,9 +130,18 @@ export default class Retention extends React.PureComponent {
       );
     }
 
+    let title = null;
+    switch(frequency) {
+    case 'day':
+      title = <FormattedMessage id='admin.dashboard.daily_retention' defaultMessage='User retention rate by day after sign-up' />;
+      break;
+    default:
+      title = <FormattedMessage id='admin.dashboard.monthly_retention' defaultMessage='User retention rate by month after sign-up' />;
+    };
+
     return (
       <div className='retention'>
-        <h4><FormattedMessage id='admin.dashboard.retention' defaultMessage='Retention' /></h4>
+        <h4>{title}</h4>
 
         {content}
       </div>
diff --git a/app/javascript/styles/mastodon/components.scss b/app/javascript/styles/mastodon/components.scss
index 3343e9bd38..90c1bb88be 100644
--- a/app/javascript/styles/mastodon/components.scss
+++ b/app/javascript/styles/mastodon/components.scss
@@ -3074,17 +3074,20 @@ a.account__display-name {
   box-sizing: border-box;
   width: 100%;
   margin: 0;
-  color: $inverted-text-color;
-  background: $simple-background-color;
-  padding: 10px;
+  color: $darker-text-color;
+  background: transparent;
+  padding: 7px 0;
   font-family: inherit;
   font-size: 14px;
   resize: vertical;
   border: 0;
+  border-bottom: 2px solid $ui-primary-color;
   outline: 0;
-  border-radius: 4px;
 
-  &:focus {
+  &:focus,
+  &:active {
+    color: $primary-text-color;
+    border-bottom-color: $ui-highlight-color;
     outline: 0;
   }
 
diff --git a/app/models/admin/action_log_filter.rb b/app/models/admin/action_log_filter.rb
index 2af9d7c9c6..12136223be 100644
--- a/app/models/admin/action_log_filter.rb
+++ b/app/models/admin/action_log_filter.rb
@@ -26,6 +26,7 @@ class Admin::ActionLogFilter
     destroy_domain_allow: { target_type: 'DomainAllow', action: 'destroy' }.freeze,
     destroy_domain_block: { target_type: 'DomainBlock', action: 'destroy' }.freeze,
     destroy_email_domain_block: { target_type: 'EmailDomainBlock', action: 'destroy' }.freeze,
+    destroy_instance: { target_type: 'Instance', action: 'destroy' }.freeze,
     destroy_unavailable_domain: { target_type: 'UnavailableDomain', action: 'destroy' }.freeze,
     destroy_status: { target_type: 'Status', action: 'destroy' }.freeze,
     disable_2fa_user: { target_type: 'User', action: 'disable' }.freeze,
@@ -49,6 +50,7 @@ class Admin::ActionLogFilter
     update_announcement: { target_type: 'Announcement', action: 'update' }.freeze,
     update_custom_emoji: { target_type: 'CustomEmoji', action: 'update' }.freeze,
     update_status: { target_type: 'Status', action: 'update' }.freeze,
+    unblock_email_account: { target_type: 'Account', action: 'unblock_email' }.freeze,
   }.freeze
 
   attr_reader :params
diff --git a/app/models/canonical_email_block.rb b/app/models/canonical_email_block.rb
index be8c45bfe3..94781386c9 100644
--- a/app/models/canonical_email_block.rb
+++ b/app/models/canonical_email_block.rb
@@ -24,4 +24,8 @@ class CanonicalEmailBlock < ApplicationRecord
   def self.block?(email)
     where(canonical_email_hash: email_to_canonical_email_hash(email)).exists?
   end
+
+  def self.find_blocks(email)
+    where(canonical_email_hash: email_to_canonical_email_hash(email))
+  end
 end
diff --git a/app/policies/account_policy.rb b/app/policies/account_policy.rb
index 672e1786bf..46237e45c1 100644
--- a/app/policies/account_policy.rb
+++ b/app/policies/account_policy.rb
@@ -64,4 +64,8 @@ class AccountPolicy < ApplicationPolicy
   def memorialize?
     admin? && !record.user&.admin? && !record.instance_actor?
   end
+
+  def unblock_email?
+    staff?
+  end
 end
diff --git a/app/policies/instance_policy.rb b/app/policies/instance_policy.rb
index a73823556c..801ca162e3 100644
--- a/app/policies/instance_policy.rb
+++ b/app/policies/instance_policy.rb
@@ -8,4 +8,8 @@ class InstancePolicy < ApplicationPolicy
   def show?
     admin?
   end
+
+  def destroy?
+    admin?
+  end
 end
diff --git a/app/services/purge_domain_service.rb b/app/services/purge_domain_service.rb
new file mode 100644
index 0000000000..e10a8f0c86
--- /dev/null
+++ b/app/services/purge_domain_service.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class PurgeDomainService < BaseService
+  def call(domain)
+    Account.remote.where(domain: domain).reorder(nil).find_each do |account|
+      DeleteAccountService.new.call(account, reserve_username: false, skip_side_effects: true)
+    end
+    Instance.refresh
+  end
+end
diff --git a/app/views/admin/accounts/show.html.haml b/app/views/admin/accounts/show.html.haml
index 2b6e28e8dd..64cfc9a77b 100644
--- a/app/views/admin/accounts/show.html.haml
+++ b/app/views/admin/accounts/show.html.haml
@@ -71,7 +71,9 @@
           = t('admin.accounts.no_limits_imposed')
       .dashboard__counters__label= t 'admin.accounts.login_status'
 
-- unless @account.local? && @account.user.nil?
+- if @account.local? && @account.user.nil?
+  = link_to t('admin.accounts.unblock_email'), unblock_email_admin_account_path(@account.id), method: :post, class: 'button' if can?(:unblock_email, @account) && CanonicalEmailBlock.where(reference_account_id: @account.id).exists?
+- else
   .table-wrapper
     %table.table.inline-table
       %tbody
diff --git a/app/views/admin/instances/show.html.haml b/app/views/admin/instances/show.html.haml
index d6542ac3e2..e520bca0cc 100644
--- a/app/views/admin/instances/show.html.haml
+++ b/app/views/admin/instances/show.html.haml
@@ -84,3 +84,5 @@
       = link_to t('admin.instances.delivery.stop'), stop_delivery_admin_instance_path(@instance), data: { confirm: t('admin.accounts.are_you_sure'), method: :post }, class: 'button'
     - else
       = link_to t('admin.instances.delivery.restart'), restart_delivery_admin_instance_path(@instance), data: { confirm: t('admin.accounts.are_you_sure'), method: :post }, class: 'button'
+    - unless @instance.delivery_failure_tracker.available? && @instance.accounts_count > 0
+      = link_to t('admin.instances.purge'), admin_instance_path(@instance), data: { confirm: t('admin.instances.confirm_purge'), method: :delete }, class: 'button'
diff --git a/app/workers/admin/domain_purge_worker.rb b/app/workers/admin/domain_purge_worker.rb
new file mode 100644
index 0000000000..7cba2c89e6
--- /dev/null
+++ b/app/workers/admin/domain_purge_worker.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class Admin::DomainPurgeWorker
+  include Sidekiq::Worker
+
+  def perform(domain)
+    PurgeDomainService.new.call(domain)
+  end
+end
diff --git a/config/locales/en.yml b/config/locales/en.yml
index e9a0aea548..32b48dbfff 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -208,6 +208,8 @@ en:
       suspension_irreversible: The data of this account has been irreversibly deleted. You can unsuspend the account to make it usable but it will not recover any data it previously had.
       suspension_reversible_hint_html: The account has been suspended, and the data will be fully removed on %{date}. Until then, the account can be restored without any ill effects. If you wish to remove all of the account's data immediately, you can do so below.
       title: Accounts
+      unblock_email: Unblock email address
+      unblocked_email_msg: Successfully unblocked %{username}'s email address
       unconfirmed_email: Unconfirmed email
       undo_sensitized: Undo force-sensitive
       undo_silenced: Undo limit
@@ -240,6 +242,7 @@ en:
         destroy_domain_allow: Delete Domain Allow
         destroy_domain_block: Delete Domain Block
         destroy_email_domain_block: Delete E-mail Domain Block
+        destroy_instance: Purge Domain
         destroy_ip_block: Delete IP rule
         destroy_status: Delete Post
         destroy_unavailable_domain: Delete Unavailable Domain
@@ -261,6 +264,7 @@ en:
         silence_account: Limit Account
         suspend_account: Suspend Account
         unassigned_report: Unassign Report
+        unblock_email_account: Unblock email address
         unsensitive_account: Undo Force-Sensitive Account
         unsilence_account: Undo Limit Account
         unsuspend_account: Unsuspend Account
@@ -287,6 +291,7 @@ en:
         destroy_domain_allow_html: "%{name} disallowed federation with domain %{target}"
         destroy_domain_block_html: "%{name} unblocked domain %{target}"
         destroy_email_domain_block_html: "%{name} unblocked e-mail domain %{target}"
+        destroy_instance_html: "%{name} purged domain %{target}"
         destroy_ip_block_html: "%{name} deleted rule for IP %{target}"
         destroy_status_html: "%{name} removed post by %{target}"
         destroy_unavailable_domain_html: "%{name} resumed delivery to domain %{target}"
@@ -308,6 +313,7 @@ en:
         silence_account_html: "%{name} limited %{target}'s account"
         suspend_account_html: "%{name} suspended %{target}'s account"
         unassigned_report_html: "%{name} unassigned report %{target}"
+        unblock_email_account_html: "%{name} unblocked %{target}'s email address"
         unsensitive_account_html: "%{name} unmarked %{target}'s media as sensitive"
         unsilence_account_html: "%{name} undid limit of %{target}'s account"
         unsuspend_account_html: "%{name} unsuspended %{target}'s account"
@@ -465,6 +471,7 @@ en:
       back_to_limited: Limited
       back_to_warning: Warning
       by_domain: Domain
+      confirm_purge: Are you sure you want to permanently delete data from this domain?
       delivery:
         all: All
         clear: Clear delivery errors
@@ -480,6 +487,7 @@ en:
       delivery_available: Delivery is available
       delivery_error_days: Delivery error days
       delivery_error_hint: If delivery is not possible for %{count} days, it will be automatically marked as undeliverable.
+      destroyed_msg: Data from %{domain} is now queued for imminent deletion.
       empty: No domains found.
       known_accounts:
         one: "%{count} known account"
@@ -490,6 +498,7 @@ en:
         title: Moderation
       private_comment: Private comment
       public_comment: Public comment
+      purge: Purge
       title: Federation
       total_blocked_by_us: Blocked by us
       total_followed_by_them: Followed by them
diff --git a/config/routes.rb b/config/routes.rb
index 8b1da422f6..285a1cdc93 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -216,7 +216,7 @@ Rails.application.routes.draw do
       end
     end
 
-    resources :instances, only: [:index, :show], constraints: { id: /[^\/]+/ } do
+    resources :instances, only: [:index, :show, :destroy], constraints: { id: /[^\/]+/ } do
       member do
         post :clear_delivery_errors
         post :restart_delivery
@@ -251,6 +251,7 @@ Rails.application.routes.draw do
         post :memorialize
         post :approve
         post :reject
+        post :unblock_email
       end
 
       collection do
diff --git a/lib/cli.rb b/lib/cli.rb
index 8815e137ad..35c00e736f 100644
--- a/lib/cli.rb
+++ b/lib/cli.rb
@@ -13,6 +13,7 @@ require_relative 'mastodon/preview_cards_cli'
 require_relative 'mastodon/cache_cli'
 require_relative 'mastodon/upgrade_cli'
 require_relative 'mastodon/email_domain_blocks_cli'
+require_relative 'mastodon/canonical_email_blocks_cli'
 require_relative 'mastodon/ip_blocks_cli'
 require_relative 'mastodon/maintenance_cli'
 require_relative 'mastodon/version'
@@ -62,6 +63,9 @@ module Mastodon
     desc 'ip_blocks SUBCOMMAND ...ARGS', 'Manage IP blocks'
     subcommand 'ip_blocks', Mastodon::IpBlocksCLI
 
+    desc 'canonical_email_blocks SUBCOMMAND ...ARGS', 'Manage canonical e-mail blocks'
+    subcommand 'canonical_email_blocks', Mastodon::CanonicalEmailBlocksCLI
+
     desc 'maintenance SUBCOMMAND ...ARGS', 'Various maintenance utilities'
     subcommand 'maintenance', Mastodon::MaintenanceCLI
 
diff --git a/lib/mastodon/canonical_email_blocks_cli.rb b/lib/mastodon/canonical_email_blocks_cli.rb
new file mode 100644
index 0000000000..64b72e6031
--- /dev/null
+++ b/lib/mastodon/canonical_email_blocks_cli.rb
@@ -0,0 +1,64 @@
+# frozen_string_literal: true
+
+require 'concurrent'
+require_relative '../../config/boot'
+require_relative '../../config/environment'
+require_relative 'cli_helper'
+
+module Mastodon
+  class CanonicalEmailBlocksCLI < Thor
+    include CLIHelper
+
+    def self.exit_on_failure?
+      true
+    end
+
+    desc 'find EMAIL', 'Find a given e-mail address in the canonical e-mail blocks'
+    long_desc <<-LONG_DESC
+      When suspending a local user, a hash of a "canonical" version of their e-mail
+      address is stored to prevent them from signing up again.
+
+      This command can be used to find whether a known email address is blocked,
+      and if so, which account it was attached to.
+    LONG_DESC
+    def find(email)
+      accts = CanonicalEmailBlock.find_blocks(email).map(&:reference_account).map(&:acct).to_a
+      if accts.empty?
+        say("#{email} is not blocked", :yellow)
+      else
+        accts.each do |acct|
+          say(acct, :white)
+        end
+      end
+    end
+
+    desc 'remove EMAIL', 'Remove a canonical e-mail block'
+    long_desc <<-LONG_DESC
+      When suspending a local user, a hash of a "canonical" version of their e-mail
+      address is stored to prevent them from signing up again.
+
+      This command allows removing a canonical email block.
+    LONG_DESC
+    def remove(email)
+      blocks = CanonicalEmailBlock.find_blocks(email)
+      if blocks.empty?
+        say("#{email} is not blocked", :yellow)
+      else
+        blocks.destroy_all
+        say("Removed canonical email block for #{email}", :green)
+      end
+    end
+
+    private
+
+    def color(processed, failed)
+      if !processed.zero? && failed.zero?
+        :green
+      elsif failed.zero?
+        :yellow
+      else
+        :red
+      end
+    end
+  end
+end
diff --git a/spec/controllers/admin/accounts_controller_spec.rb b/spec/controllers/admin/accounts_controller_spec.rb
index a5ef396ae4..3edbde03cb 100644
--- a/spec/controllers/admin/accounts_controller_spec.rb
+++ b/spec/controllers/admin/accounts_controller_spec.rb
@@ -192,4 +192,36 @@ RSpec.describe Admin::AccountsController, type: :controller do
       end
     end
   end
+
+  describe 'POST #unblock_email' do
+    subject do
+      -> { post :unblock_email, params: { id: account.id } }
+    end
+
+    let(:current_user) { Fabricate(:user, admin: admin) }
+    let(:account) { Fabricate(:account, suspended: true) }
+    let!(:email_block) { Fabricate(:canonical_email_block, reference_account: account) }
+
+    context 'when user is admin' do
+      let(:admin) { true }
+
+      it 'succeeds in removing email blocks' do
+        is_expected.to change { CanonicalEmailBlock.where(reference_account: account).count }.from(1).to(0)
+      end
+
+      it 'redirects to admin account path' do
+        subject.call
+        expect(response).to redirect_to admin_account_path(account.id)
+      end
+    end
+
+    context 'when user is not admin' do
+      let(:admin) { false }
+
+      it 'fails to remove avatar' do
+        subject.call
+        expect(response).to have_http_status :forbidden
+      end
+    end
+  end
 end
diff --git a/spec/controllers/admin/instances_controller_spec.rb b/spec/controllers/admin/instances_controller_spec.rb
index 8c0b309f2a..53427b8748 100644
--- a/spec/controllers/admin/instances_controller_spec.rb
+++ b/spec/controllers/admin/instances_controller_spec.rb
@@ -3,8 +3,14 @@ require 'rails_helper'
 RSpec.describe Admin::InstancesController, type: :controller do
   render_views
 
+  let(:current_user) { Fabricate(:user, admin: true) }
+
+  let!(:account)     { Fabricate(:account, domain: 'popular') }
+  let!(:account2)    { Fabricate(:account, domain: 'popular') }
+  let!(:account3)    { Fabricate(:account, domain: 'less.popular') }
+
   before do
-    sign_in Fabricate(:user, admin: true), scope: :user
+    sign_in current_user, scope: :user
   end
 
   describe 'GET #index' do
@@ -16,10 +22,6 @@ RSpec.describe Admin::InstancesController, type: :controller do
     end
 
     it 'renders instances' do
-      Fabricate(:account, domain: 'popular')
-      Fabricate(:account, domain: 'popular')
-      Fabricate(:account, domain: 'less.popular')
-
       get :index, params: { page: 2 }
 
       instances = assigns(:instances).to_a
@@ -29,4 +31,27 @@ RSpec.describe Admin::InstancesController, type: :controller do
       expect(response).to have_http_status(200)
     end
   end
+
+  describe 'DELETE #destroy' do
+    subject { delete :destroy, params: { id: Instance.first.id } }
+
+    let(:current_user) { Fabricate(:user, admin: admin) }
+    let(:account) { Fabricate(:account) }
+
+    context 'when user is admin' do
+      let(:admin) { true }
+
+      it 'succeeds in purging instance' do
+        is_expected.to redirect_to admin_instances_path
+      end
+    end
+
+    context 'when user is not admin' do
+      let(:admin) { false }
+
+      it 'fails to purge instance' do
+        is_expected.to have_http_status :forbidden
+      end
+    end
+  end
 end
diff --git a/spec/policies/account_policy_spec.rb b/spec/policies/account_policy_spec.rb
index 1347ca4a03..8a5e62c06e 100644
--- a/spec/policies/account_policy_spec.rb
+++ b/spec/policies/account_policy_spec.rb
@@ -37,7 +37,7 @@ RSpec.describe AccountPolicy do
     end
   end
 
-  permissions :unsuspend? do
+  permissions :unsuspend?, :unblock_email? do
     before do
       alice.suspend!
     end
diff --git a/spec/policies/instance_policy_spec.rb b/spec/policies/instance_policy_spec.rb
index 77a3bde3fb..72cf25f568 100644
--- a/spec/policies/instance_policy_spec.rb
+++ b/spec/policies/instance_policy_spec.rb
@@ -8,7 +8,7 @@ RSpec.describe InstancePolicy do
   let(:admin)   { Fabricate(:user, admin: true).account }
   let(:john)    { Fabricate(:user).account }
 
-  permissions :index? do
+  permissions :index?, :show?, :destroy? do
     context 'admin' do
       it 'permits' do
         expect(subject).to permit(admin, Instance)
diff --git a/spec/services/purge_domain_service_spec.rb b/spec/services/purge_domain_service_spec.rb
new file mode 100644
index 0000000000..59285f1269
--- /dev/null
+++ b/spec/services/purge_domain_service_spec.rb
@@ -0,0 +1,27 @@
+require 'rails_helper'
+
+RSpec.describe PurgeDomainService, type: :service do
+  let!(:old_account) { Fabricate(:account, domain: 'obsolete.org') }
+  let!(:old_status1) { Fabricate(:status, account: old_account) }
+  let!(:old_status2) { Fabricate(:status, account: old_account) }
+  let!(:old_attachment) { Fabricate(:media_attachment, account: old_account, status: old_status2, file: attachment_fixture('attachment.jpg')) }
+
+  subject { PurgeDomainService.new }
+
+  describe 'for a suspension' do
+    before do
+      subject.call('obsolete.org')
+    end
+
+    it 'removes the remote accounts\'s statuses and media attachments' do
+      expect { old_account.reload }.to raise_exception ActiveRecord::RecordNotFound
+      expect { old_status1.reload }.to raise_exception ActiveRecord::RecordNotFound
+      expect { old_status2.reload }.to raise_exception ActiveRecord::RecordNotFound
+      expect { old_attachment.reload }.to raise_exception ActiveRecord::RecordNotFound
+    end
+
+    it 'refreshes instances view' do
+      expect(Instance.where(domain: 'obsolete.org').exists?).to be false
+    end
+  end
+end
diff --git a/spec/workers/admin/domain_purge_worker_spec.rb b/spec/workers/admin/domain_purge_worker_spec.rb
new file mode 100644
index 0000000000..b67c58b234
--- /dev/null
+++ b/spec/workers/admin/domain_purge_worker_spec.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe Admin::DomainPurgeWorker do
+  subject { described_class.new }
+
+  describe 'perform' do
+    it 'calls domain purge service for relevant domain block' do
+      service = double(call: nil)
+      allow(PurgeDomainService).to receive(:new).and_return(service)
+      result = subject.perform('example.com')
+
+      expect(result).to be_nil
+      expect(service).to have_received(:call).with('example.com')
+    end
+  end
+end