diff --git a/app/controllers/admin/email_domain_blocks_controller.rb b/app/controllers/admin/email_domain_blocks_controller.rb
index c2591972624..f7bdfb0c5f6 100644
--- a/app/controllers/admin/email_domain_blocks_controller.rb
+++ b/app/controllers/admin/email_domain_blocks_controller.rb
@@ -27,7 +27,7 @@ module Admin
           ips       = []
 
           Resolv::DNS.open do |dns|
-            dns.timeouts = 1
+            dns.timeouts = 5
 
             hostnames = dns.getresources(@email_domain_block.domain, Resolv::DNS::Resource::IN::MX).to_a.map { |e| e.exchange.to_s }
 
diff --git a/app/javascript/packs/public.js b/app/javascript/packs/public.js
index 3d190d2dace..5ad25a9b0f5 100644
--- a/app/javascript/packs/public.js
+++ b/app/javascript/packs/public.js
@@ -99,6 +99,28 @@ function main() {
       new Rellax('.parallax', { speed: -1 });
     }
 
+    delegate(document, '#registration_user_password_confirmation,#registration_user_password', 'input', () => {
+      const password = document.getElementById('registration_user_password');
+      const confirmation = document.getElementById('registration_user_password_confirmation');
+      if (password.value && password.value !== confirmation.value) {
+        confirmation.setCustomValidity((new IntlMessageFormat(messages['password_confirmation.mismatching'] || 'Password confirmation does not match', locale)).format());
+      } else {
+        confirmation.setCustomValidity('');
+      }
+    });
+
+    delegate(document, '#user_password,#user_password_confirmation', 'input', () => {
+      const password = document.getElementById('user_password');
+      const confirmation = document.getElementById('user_password_confirmation');
+      if (!confirmation) return;
+
+      if (password.value && password.value !== confirmation.value) {
+        confirmation.setCustomValidity((new IntlMessageFormat(messages['password_confirmation.mismatching'] || 'Password confirmation does not match', locale)).format());
+      } else {
+        confirmation.setCustomValidity('');
+      }
+    });
+
     delegate(document, '.custom-emoji', 'mouseover', getEmojiAnimationHandler('data-original'));
     delegate(document, '.custom-emoji', 'mouseout', getEmojiAnimationHandler('data-static'));
 
diff --git a/app/javascript/styles/mastodon/forms.scss b/app/javascript/styles/mastodon/forms.scss
index 7a0b2f9a398..a6df51f9547 100644
--- a/app/javascript/styles/mastodon/forms.scss
+++ b/app/javascript/styles/mastodon/forms.scss
@@ -364,7 +364,8 @@ code {
       box-shadow: none;
     }
 
-    &:focus:invalid:not(:placeholder-shown) {
+    &:focus:invalid:not(:placeholder-shown),
+    &:required:invalid:not(:placeholder-shown) {
       border-color: lighten($error-red, 12%);
     }
 
diff --git a/app/validators/blacklisted_email_validator.rb b/app/validators/blacklisted_email_validator.rb
index 0d01a1c47fb..16e3abf1298 100644
--- a/app/validators/blacklisted_email_validator.rb
+++ b/app/validators/blacklisted_email_validator.rb
@@ -6,7 +6,7 @@ class BlacklistedEmailValidator < ActiveModel::Validator
 
     @email = user.email
 
-    user.errors.add(:email, I18n.t('users.invalid_email')) if blocked_email?
+    user.errors.add(:email, I18n.t('users.blocked_email_provider')) if blocked_email?
   end
 
   private
diff --git a/app/validators/email_mx_validator.rb b/app/validators/email_mx_validator.rb
index 9b500996683..ef1554494cc 100644
--- a/app/validators/email_mx_validator.rb
+++ b/app/validators/email_mx_validator.rb
@@ -4,22 +4,38 @@ require 'resolv'
 
 class EmailMxValidator < ActiveModel::Validator
   def validate(user)
-    user.errors.add(:email, I18n.t('users.invalid_email')) if invalid_mx?(user.email)
+    domain = get_domain(user.email)
+
+    if domain.nil?
+      user.errors.add(:email, I18n.t('users.invalid_email'))
+    else
+      ips, hostnames = resolve_mx(domain)
+      if ips.empty?
+        user.errors.add(:email, I18n.t('users.invalid_email_mx'))
+      elsif on_blacklist?(hostnames + ips)
+        user.errors.add(:email, I18n.t('users.blocked_email_provider'))
+      end
+    end
   end
 
   private
 
-  def invalid_mx?(value)
+  def get_domain(value)
     _, domain = value.split('@', 2)
 
-    return true if domain.nil?
+    return nil if domain.nil?
 
-    domain    = TagManager.instance.normalize_domain(domain)
+    TagManager.instance.normalize_domain(domain)
+  rescue Addressable::URI::InvalidURIError
+    nil
+  end
+
+  def resolve_mx(domain)
     hostnames = []
     ips       = []
 
     Resolv::DNS.open do |dns|
-      dns.timeouts = 1
+      dns.timeouts = 5
 
       hostnames = dns.getresources(domain, Resolv::DNS::Resource::IN::MX).to_a.map { |e| e.exchange.to_s }
 
@@ -29,9 +45,7 @@ class EmailMxValidator < ActiveModel::Validator
       end
     end
 
-    ips.empty? || on_blacklist?(hostnames + ips)
-  rescue Addressable::URI::InvalidURIError
-    true
+    [ips, hostnames]
   end
 
   def on_blacklist?(values)
diff --git a/app/views/about/_registration.html.haml b/app/views/about/_registration.html.haml
index af28e217491..336acad6ac6 100644
--- a/app/views/about/_registration.html.haml
+++ b/app/views/about/_registration.html.haml
@@ -1,13 +1,13 @@
 .simple_form__overlay-area{ class: (closed_registrations? && @instance_presenter.closed_registrations_message.present?) ? 'simple_form__overlay-area__blurred' : '' }
-  = simple_form_for(new_user, url: user_registration_path, namespace: 'registration') do |f|
+  = simple_form_for(new_user, url: user_registration_path, namespace: 'registration', html: { novalidate: false }) do |f|
     %p.lead= t('about.federation_hint_html', instance: content_tag(:strong, site_hostname))
 
     .fields-group
       = f.simple_fields_for :account do |account_fields|
-        = account_fields.input :username, wrapper: :with_label, label: false, required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.username'), :autocomplete => 'off', placeholder: t('simple_form.labels.defaults.username') }, append: "@#{site_hostname}", hint: false, disabled: closed_registrations?
+        = account_fields.input :username, wrapper: :with_label, label: false, required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.username'), :autocomplete => 'off', placeholder: t('simple_form.labels.defaults.username'), pattern: '[a-z0-9_]+', maxlength: 30 }, append: "@#{site_hostname}", hint: false, disabled: closed_registrations?
 
       = f.input :email, placeholder: t('simple_form.labels.defaults.email'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.email'), :autocomplete => 'off' }, hint: false, disabled: closed_registrations?
-      = f.input :password, placeholder: t('simple_form.labels.defaults.password'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.password'), :autocomplete => 'off' }, hint: false, disabled: closed_registrations?
+      = f.input :password, placeholder: t('simple_form.labels.defaults.password'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.password'), :autocomplete => 'off', :minlength => User.password_length.first, :maxlength => User.password_length.last }, hint: false, disabled: closed_registrations?
       = f.input :password_confirmation, placeholder: t('simple_form.labels.defaults.confirm_password'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.confirm_password'), :autocomplete => 'off' }, hint: false, disabled: closed_registrations?
 
     - if approved_registrations?
@@ -16,7 +16,7 @@
           = invite_request_fields.input :text, as: :text, wrapper: :with_block_label, required: false
 
     .fields-group
-      = f.input :agreement, as: :boolean, wrapper: :with_label, label: t('auth.checkbox_agreement_html', rules_path: about_more_path, terms_path: terms_path), disabled: closed_registrations?
+      = f.input :agreement, as: :boolean, wrapper: :with_label, label: t('auth.checkbox_agreement_html', rules_path: about_more_path, terms_path: terms_path), required: true, disabled: closed_registrations?
 
     .actions
       = f.button :button, sign_up_message, type: :submit, class: 'button button-primary', disabled: closed_registrations?
diff --git a/app/views/auth/passwords/edit.html.haml b/app/views/auth/passwords/edit.html.haml
index 383d44f00fa..114a7445422 100644
--- a/app/views/auth/passwords/edit.html.haml
+++ b/app/views/auth/passwords/edit.html.haml
@@ -1,14 +1,14 @@
 - content_for :page_title do
   = t('auth.set_new_password')
 
-= simple_form_for(resource, as: resource_name, url: password_path(resource_name), html: { method: :put }) do |f|
+= simple_form_for(resource, as: resource_name, url: password_path(resource_name), html: { method: :put, novalidate: false }) do |f|
   = render 'shared/error_messages', object: resource
 
   - if !use_seamless_external_login? || resource.encrypted_password.present?
     = f.input :reset_password_token, as: :hidden
 
     .fields-group
-      = f.input :password, wrapper: :with_label, autofocus: true, label: t('simple_form.labels.defaults.new_password'), input_html: { 'aria-label' => t('simple_form.labels.defaults.new_password'), :autocomplete => 'off' }, required: true
+      = f.input :password, wrapper: :with_label, autofocus: true, label: t('simple_form.labels.defaults.new_password'), input_html: { 'aria-label' => t('simple_form.labels.defaults.new_password'), :autocomplete => 'off', :minlength => User.password_length.first, :maxlength => User.password_length.last }, required: true
     .fields-group
       = f.input :password_confirmation, wrapper: :with_label, label: t('simple_form.labels.defaults.confirm_new_password'), input_html: { 'aria-label' => t('simple_form.labels.defaults.confirm_new_password'), :autocomplete => 'off' }, required: true
 
diff --git a/app/views/auth/registrations/edit.html.haml b/app/views/auth/registrations/edit.html.haml
index a155c75c987..4a46b27a93c 100644
--- a/app/views/auth/registrations/edit.html.haml
+++ b/app/views/auth/registrations/edit.html.haml
@@ -5,7 +5,7 @@
 
 %h3= t('auth.security')
 
-= simple_form_for(resource, as: resource_name, url: registration_path(resource_name), html: { method: :put, class: 'auth_edit' }) do |f|
+= simple_form_for(resource, as: resource_name, url: registration_path(resource_name), html: { method: :put, class: 'auth_edit', novalidate: false }) do |f|
   = render 'shared/error_messages', object: resource
 
   - if !use_seamless_external_login? || resource.encrypted_password.present?
@@ -17,7 +17,7 @@
 
     .fields-row
       .fields-row__column.fields-group.fields-row__column-6
-        = f.input :password, wrapper: :with_label, label: t('simple_form.labels.defaults.new_password'), input_html: { 'aria-label' => t('simple_form.labels.defaults.new_password'), :autocomplete => 'off' }, hint: t('simple_form.hints.defaults.password'), disabled: current_account.suspended?
+        = f.input :password, wrapper: :with_label, label: t('simple_form.labels.defaults.new_password'), input_html: { 'aria-label' => t('simple_form.labels.defaults.new_password'), :autocomplete => 'off', :minlength => User.password_length.first, :maxlength => User.password_length.last }, hint: t('simple_form.hints.defaults.password'), disabled: current_account.suspended?
       .fields-row__column.fields-group.fields-row__column-6
         = f.input :password_confirmation, wrapper: :with_label, label: t('simple_form.labels.defaults.confirm_new_password'), input_html: { 'aria-label' => t('simple_form.labels.defaults.confirm_new_password'), :autocomplete => 'off' }, disabled: current_account.suspended?
 
diff --git a/app/views/auth/registrations/new.html.haml b/app/views/auth/registrations/new.html.haml
index 457bc1d2314..d5698b42626 100644
--- a/app/views/auth/registrations/new.html.haml
+++ b/app/views/auth/registrations/new.html.haml
@@ -4,7 +4,7 @@
 - content_for :header_tags do
   = render partial: 'shared/og', locals: { description: description_for_sign_up }
 
-= simple_form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f|
+= simple_form_for(resource, as: resource_name, url: registration_path(resource_name), html: { novalidate: false }) do |f|
   = render 'shared/error_messages', object: resource
 
   - if @invite.present? && @invite.autofollow?
@@ -14,13 +14,13 @@
 
   = f.simple_fields_for :account do |ff|
     .fields-group
-      = ff.input :username, wrapper: :with_label, autofocus: true, label: t('simple_form.labels.defaults.username'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.username'), :autocomplete => 'off' }, append: "@#{site_hostname}", hint: t('simple_form.hints.defaults.username', domain: site_hostname)
+      = ff.input :username, wrapper: :with_label, autofocus: true, label: t('simple_form.labels.defaults.username'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.username'), :autocomplete => 'off', pattern: '[a-z0-9_]+', maxlength: 30 }, append: "@#{site_hostname}", hint: t('simple_form.hints.defaults.username', domain: site_hostname)
 
   .fields-group
     = f.input :email, wrapper: :with_label, label: t('simple_form.labels.defaults.email'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.email'), :autocomplete => 'off' }
 
   .fields-group
-    = f.input :password, wrapper: :with_label, label: t('simple_form.labels.defaults.password'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.password'), :autocomplete => 'off' }
+    = f.input :password, wrapper: :with_label, label: t('simple_form.labels.defaults.password'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.password'), :autocomplete => 'off', :minlength => User.password_length.first, :maxlength => User.password_length.last }
 
   .fields-group
     = f.input :password_confirmation, wrapper: :with_label, label: t('simple_form.labels.defaults.confirm_password'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.confirm_password'), :autocomplete => 'off' }
@@ -33,7 +33,7 @@
   = f.input :invite_code, as: :hidden
 
   .fields-group
-    = f.input :agreement, as: :boolean, wrapper: :with_label, label: whitelist_mode? ? t('auth.checkbox_agreement_without_rules_html', terms_path: terms_path) : t('auth.checkbox_agreement_html', rules_path: about_more_path, terms_path: terms_path)
+    = f.input :agreement, as: :boolean, wrapper: :with_label, label: whitelist_mode? ? t('auth.checkbox_agreement_without_rules_html', terms_path: terms_path) : t('auth.checkbox_agreement_html', rules_path: about_more_path, terms_path: terms_path), required: true
 
   .actions
     = f.button :button, @invite.present? ? t('auth.register') : sign_up_message, type: :submit
diff --git a/app/views/statuses/_simple_status.html.haml b/app/views/statuses/_simple_status.html.haml
index d6ab7a837f9..f2b6866e916 100644
--- a/app/views/statuses/_simple_status.html.haml
+++ b/app/views/statuses/_simple_status.html.haml
@@ -17,7 +17,7 @@
         %span.display-name
           %bdi
             %strong.display-name__html.p-name.emojify= display_name(status.account, custom_emojify: true, autoplay: autoplay)
-          &nbsp;
+          = ' '
           %span.display-name__account
             = acct(status.account)
             = fa_icon('lock') if status.account.locked?
diff --git a/config/locales/en.yml b/config/locales/en.yml
index 2cae0a3e3ba..40adfc21e4d 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -1325,9 +1325,11 @@ en:
       tips: Tips
       title: Welcome aboard, %{name}!
   users:
+    blocked_email_provider: This e-mail provider isn't allowed
     follow_limit_reached: You cannot follow more than %{limit} people
     generic_access_help_html: Trouble accessing your account? You may get in touch with %{email} for assistance
     invalid_email: The e-mail address is invalid
+    invalid_email_mx: The e-mail address does not seem to exist
     invalid_otp_token: Invalid two-factor code
     invalid_sign_in_token: Invalid security code
     otp_lost_help_html: If you lost access to both, you may get in touch with %{email}
diff --git a/lib/mastodon/email_domain_blocks_cli.rb b/lib/mastodon/email_domain_blocks_cli.rb
index 7fe1efaaa5c..55a637d6828 100644
--- a/lib/mastodon/email_domain_blocks_cli.rb
+++ b/lib/mastodon/email_domain_blocks_cli.rb
@@ -63,7 +63,7 @@ module Mastodon
         ips       = []
 
         Resolv::DNS.open do |dns|
-          dns.timeouts = 1
+          dns.timeouts = 5
           hostnames = dns.getresources(email_domain_block.domain, Resolv::DNS::Resource::IN::MX).to_a.map { |e| e.exchange.to_s }
 
           ([email_domain_block.domain] + hostnames).uniq.each do |hostname|
diff --git a/spec/validators/blacklisted_email_validator_spec.rb b/spec/validators/blacklisted_email_validator_spec.rb
index ccc5dc0f485..f0708dc4623 100644
--- a/spec/validators/blacklisted_email_validator_spec.rb
+++ b/spec/validators/blacklisted_email_validator_spec.rb
@@ -17,7 +17,7 @@ RSpec.describe BlacklistedEmailValidator, type: :validator do
       let(:blocked_email) { true }
 
       it 'calls errors.add' do
-        expect(errors).to have_received(:add).with(:email, I18n.t('users.invalid_email'))
+        expect(errors).to have_received(:add).with(:email, I18n.t('users.blocked_email_provider'))
       end
     end
 
@@ -25,7 +25,7 @@ RSpec.describe BlacklistedEmailValidator, type: :validator do
       let(:blocked_email) { false }
 
       it 'not calls errors.add' do
-        expect(errors).not_to have_received(:add).with(:email, I18n.t('users.invalid_email'))
+        expect(errors).not_to have_received(:add).with(:email, I18n.t('users.blocked_email_provider'))
       end
     end
   end
diff --git a/streaming/index.js b/streaming/index.js
index f5c9b4224c0..3a68e6de5f6 100644
--- a/streaming/index.js
+++ b/streaming/index.js
@@ -210,6 +210,7 @@ const startWorker = (workerId) => {
     if (subs[channel].length === 0) {
       log.verbose(`Unsubscribe ${channel}`);
       redisSubscribeClient.unsubscribe(channel);
+      delete subs[channel];
     }
   };
 
@@ -888,19 +889,21 @@ const startWorker = (workerId) => {
     channelNameToIds(request, channelName, params).then(({ channelIds }) => {
       log.verbose(request.requestId, `Ending stream from ${channelIds.join(', ')} for ${request.accountId}`);
 
-      const { listener, stopHeartbeat } = subscriptions[channelIds.join(';')];
+      const subscription = subscriptions[channelIds.join(';')];
 
-      if (!listener) {
+      if (!subscription) {
         return;
       }
 
+      const { listener, stopHeartbeat } = subscription;
+
       channelIds.forEach(channelId => {
         unsubscribe(`${redisPrefix}${channelId}`, listener);
       });
 
       stopHeartbeat();
 
-      subscriptions[channelIds.join(';')] = undefined;
+      delete subscriptions[channelIds.join(';')];
     }).catch(err => {
       log.verbose(request.requestId, 'Unsubscription error:', err);
       socket.send(JSON.stringify({ error: err.toString() }));