diff --git a/.rubocop.yml b/.rubocop.yml
index 8dc2d1c47..38a413c2e 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -243,6 +243,10 @@ Style/HashTransformKeys:
 Style/HashTransformValues:
   Enabled: false
 
+Style/HashSyntax:
+  Enabled: true
+  EnforcedStyle: ruby19_no_mixed_keys
+
 Style/IfUnlessModifier:
   Enabled: false
 
diff --git a/app/views/application/_card.html.haml b/app/views/application/_card.html.haml
index 909d9ff81..3d0e6b1da 100644
--- a/app/views/application/_card.html.haml
+++ b/app/views/application/_card.html.haml
@@ -13,4 +13,4 @@
           %strong.emojify.p-name= display_name(account, custom_emojify: true)
         %span
           = acct(account)
-          = fa_icon('lock', { :data => ({hidden: true} unless account.locked?)})
+          = fa_icon('lock', { data: ({hidden: true} unless account.locked?)})
diff --git a/app/views/auth/challenges/new.html.haml b/app/views/auth/challenges/new.html.haml
index ff4b7a506..4f21e4af6 100644
--- a/app/views/auth/challenges/new.html.haml
+++ b/app/views/auth/challenges/new.html.haml
@@ -5,7 +5,7 @@
   = f.input :return_to, as: :hidden
 
   .field-group
-    = f.input :current_password, wrapper: :with_block_label, input_html: { :autocomplete => 'current-password', :autofocus => true }, label: t('challenge.prompt'), required: true
+    = f.input :current_password, wrapper: :with_block_label, input_html: { autocomplete: 'current-password', autofocus: true }, label: t('challenge.prompt'), required: true
 
   .actions
     = f.button :button, t('challenge.confirm'), type: :submit
diff --git a/app/views/auth/confirmations/new.html.haml b/app/views/auth/confirmations/new.html.haml
index 4a1bedaa4..a294d3cb5 100644
--- a/app/views/auth/confirmations/new.html.haml
+++ b/app/views/auth/confirmations/new.html.haml
@@ -5,7 +5,7 @@
   = render 'shared/error_messages', object: resource
 
   .fields-group
-    = f.input :email, autofocus: true, wrapper: :with_label, label: t('simple_form.labels.defaults.email'), input_html: { 'aria-label' => t('simple_form.labels.defaults.email') }, hint: false
+    = f.input :email, autofocus: true, wrapper: :with_label, label: t('simple_form.labels.defaults.email'), input_html: { 'aria-label': t('simple_form.labels.defaults.email') }, hint: false
 
   .actions
     = f.button :button, t('auth.resend_confirmation'), type: :submit
diff --git a/app/views/auth/passwords/edit.html.haml b/app/views/auth/passwords/edit.html.haml
index c7dbebe75..b95a9b676 100644
--- a/app/views/auth/passwords/edit.html.haml
+++ b/app/views/auth/passwords/edit.html.haml
@@ -8,9 +8,9 @@
     = 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 => 'new-password', :minlength => User.password_length.first, :maxlength => User.password_length.last }, 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: 'new-password', 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 => 'new-password' }, required: true
+      = 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: 'new-password' }, required: true
 
     .actions
       = f.button :button, t('auth.set_new_password'), type: :submit
diff --git a/app/views/auth/passwords/new.html.haml b/app/views/auth/passwords/new.html.haml
index bae5b24ba..10ad108ea 100644
--- a/app/views/auth/passwords/new.html.haml
+++ b/app/views/auth/passwords/new.html.haml
@@ -5,7 +5,7 @@
   = render 'shared/error_messages', object: resource
 
   .fields-group
-    = f.input :email, autofocus: true, wrapper: :with_label, label: t('simple_form.labels.defaults.email'), input_html: { 'aria-label' => t('simple_form.labels.defaults.email') }, hint: false
+    = f.input :email, autofocus: true, wrapper: :with_label, label: t('simple_form.labels.defaults.email'), input_html: { 'aria-label': t('simple_form.labels.defaults.email') }, hint: false
 
   .actions
     = f.button :button, t('auth.reset_password'), type: :submit
diff --git a/app/views/auth/registrations/_sessions.html.haml b/app/views/auth/registrations/_sessions.html.haml
index 5d993f574..c094dfd25 100644
--- a/app/views/auth/registrations/_sessions.html.haml
+++ b/app/views/auth/registrations/_sessions.html.haml
@@ -18,7 +18,7 @@
         %tr
           %td
             %span{ title: session.user_agent }<
-              = fa_icon "#{session_device_icon(session)} fw", 'aria-label' => session_device_icon(session)
+              = fa_icon "#{session_device_icon(session)} fw", 'aria-label': session_device_icon(session)
               = ' '
               = t 'sessions.description', browser: t("sessions.browsers.#{session.browser}", default: "#{session.browser}"), platform: t("sessions.platforms.#{session.platform}", default: "#{session.platform}")
           %td
diff --git a/app/views/auth/registrations/edit.html.haml b/app/views/auth/registrations/edit.html.haml
index c642c2293..60fd1635e 100644
--- a/app/views/auth/registrations/edit.html.haml
+++ b/app/views/auth/registrations/edit.html.haml
@@ -11,15 +11,15 @@
   - if !use_seamless_external_login? || resource.encrypted_password.present?
     .fields-row
       .fields-row__column.fields-group.fields-row__column-6
-        = f.input :email, wrapper: :with_label, input_html: { 'aria-label' => t('simple_form.labels.defaults.email') }, required: true, disabled: current_account.suspended?
+        = f.input :email, wrapper: :with_label, input_html: { 'aria-label': t('simple_form.labels.defaults.email') }, required: true, disabled: current_account.suspended?
       .fields-row__column.fields-group.fields-row__column-6
-        = f.input :current_password, wrapper: :with_label, input_html: { 'aria-label' => t('simple_form.labels.defaults.current_password'), :autocomplete => 'current-password' }, required: true, disabled: current_account.suspended?, hint: false
+        = f.input :current_password, wrapper: :with_label, input_html: { 'aria-label': t('simple_form.labels.defaults.current_password'), autocomplete: 'current-password' }, required: true, disabled: current_account.suspended?, hint: false
 
     .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 => 'new-password', :minlength => User.password_length.first, :maxlength => User.password_length.last }, 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: 'new-password', 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 => 'new-password' }, disabled: current_account.suspended?
+        = 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: 'new-password' }, disabled: current_account.suspended?
 
     .actions
       = f.button :button, t('generic.save_changes'), type: :submit, class: 'button', disabled: current_account.suspended?
diff --git a/app/views/auth/registrations/new.html.haml b/app/views/auth/registrations/new.html.haml
index b1d52dd0c..0d8fd800f 100644
--- a/app/views/auth/registrations/new.html.haml
+++ b/app/views/auth/registrations/new.html.haml
@@ -17,13 +17,13 @@
 
   .fields-group
     = f.simple_fields_for :account do |ff|
-      = ff.input :display_name, wrapper: :with_label, label: false, required: false, input_html: { 'aria-label' => t('simple_form.labels.defaults.display_name'), :autocomplete => 'off', placeholder: t('simple_form.labels.defaults.display_name') }
-      = ff.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-zA-Z0-9_]+', maxlength: 30 }, append: "@#{site_hostname}", hint: false
-    = f.input :email, placeholder: t('simple_form.labels.defaults.email'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.email'), :autocomplete => 'username' }, hint: false
-    = f.input :password, placeholder: t('simple_form.labels.defaults.password'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.password'), :autocomplete => 'new-password', :minlength => User.password_length.first, :maxlength => User.password_length.last }, hint: false
-    = 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 => 'new-password' }, hint: false
-    = f.input :confirm_password, as: :string, placeholder: t('simple_form.labels.defaults.honeypot', label: t('simple_form.labels.defaults.password')), required: false, input_html: { 'aria-label' => t('simple_form.labels.defaults.honeypot', label: t('simple_form.labels.defaults.password')), :autocomplete => 'off' }, hint: false
-    = f.input :website, as: :url, wrapper: :with_label, label: t('simple_form.labels.defaults.honeypot', label: 'Website'), required: false, input_html: { 'aria-label' => t('simple_form.labels.defaults.honeypot', label: 'Website'), :autocomplete => 'off' }
+      = ff.input :display_name, wrapper: :with_label, label: false, required: false, input_html: { 'aria-label': t('simple_form.labels.defaults.display_name'), autocomplete: 'off', placeholder: t('simple_form.labels.defaults.display_name') }
+      = ff.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-zA-Z0-9_]+', maxlength: 30 }, append: "@#{site_hostname}", hint: false
+    = f.input :email, placeholder: t('simple_form.labels.defaults.email'), required: true, input_html: { 'aria-label': t('simple_form.labels.defaults.email'), autocomplete: 'username' }, hint: false
+    = f.input :password, placeholder: t('simple_form.labels.defaults.password'), required: true, input_html: { 'aria-label': t('simple_form.labels.defaults.password'), autocomplete: 'new-password', minlength: User.password_length.first, maxlength: User.password_length.last }, hint: false
+    = 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: 'new-password' }, hint: false
+    = f.input :confirm_password, as: :string, placeholder: t('simple_form.labels.defaults.honeypot', label: t('simple_form.labels.defaults.password')), required: false, input_html: { 'aria-label': t('simple_form.labels.defaults.honeypot', label: t('simple_form.labels.defaults.password')), autocomplete: 'off' }, hint: false
+    = f.input :website, as: :url, wrapper: :with_label, label: t('simple_form.labels.defaults.honeypot', label: 'Website'), required: false, input_html: { 'aria-label': t('simple_form.labels.defaults.honeypot', label: 'Website'), autocomplete: 'off' }
 
   - if approved_registrations? && !@invite.present?
     .fields-group
diff --git a/app/views/auth/sessions/new.html.haml b/app/views/auth/sessions/new.html.haml
index 943618e39..304e3ab84 100644
--- a/app/views/auth/sessions/new.html.haml
+++ b/app/views/auth/sessions/new.html.haml
@@ -8,11 +8,11 @@
   = simple_form_for(resource, as: resource_name, url: session_path(resource_name)) do |f|
     .fields-group
       - if use_seamless_external_login?
-        = f.input :email, autofocus: true, wrapper: :with_label, label: t('simple_form.labels.defaults.username_or_email'), input_html: { 'aria-label' => t('simple_form.labels.defaults.username_or_email') }, hint: false
+        = f.input :email, autofocus: true, wrapper: :with_label, label: t('simple_form.labels.defaults.username_or_email'), input_html: { 'aria-label': t('simple_form.labels.defaults.username_or_email') }, hint: false
       - else
-        = f.input :email, autofocus: true, wrapper: :with_label, label: t('simple_form.labels.defaults.email'), input_html: { 'aria-label' => t('simple_form.labels.defaults.email') }, hint: false
+        = f.input :email, autofocus: true, wrapper: :with_label, label: t('simple_form.labels.defaults.email'), input_html: { 'aria-label': t('simple_form.labels.defaults.email') }, hint: false
     .fields-group
-      = f.input :password, wrapper: :with_label, label: t('simple_form.labels.defaults.password'), input_html: { 'aria-label' => t('simple_form.labels.defaults.password'), :autocomplete => 'current-password' }, hint: false
+      = f.input :password, wrapper: :with_label, label: t('simple_form.labels.defaults.password'), input_html: { 'aria-label': t('simple_form.labels.defaults.password'), autocomplete: 'current-password' }, hint: false
 
     .actions
       = f.button :button, t('auth.login'), type: :submit
diff --git a/app/views/auth/sessions/two_factor/_otp_authentication_form.html.haml b/app/views/auth/sessions/two_factor/_otp_authentication_form.html.haml
index 82f957527..094b502b1 100644
--- a/app/views/auth/sessions/two_factor/_otp_authentication_form.html.haml
+++ b/app/views/auth/sessions/two_factor/_otp_authentication_form.html.haml
@@ -5,7 +5,7 @@
   %p.hint.authentication-hint= t('simple_form.hints.sessions.otp')
 
   .fields-group
-    = f.input :otp_attempt, type: :number, wrapper: :with_label, label: t('simple_form.labels.defaults.otp_attempt'), input_html: { 'aria-label' => t('simple_form.labels.defaults.otp_attempt'), :autocomplete => 'one-time-code' }, autofocus: true
+    = f.input :otp_attempt, type: :number, wrapper: :with_label, label: t('simple_form.labels.defaults.otp_attempt'), input_html: { 'aria-label': t('simple_form.labels.defaults.otp_attempt'), autocomplete: 'one-time-code' }, autofocus: true
 
   .actions
     = f.button :button, t('auth.login'), type: :submit
diff --git a/app/views/auth/setup/show.html.haml b/app/views/auth/setup/show.html.haml
index c14fed56f..1a6611ceb 100644
--- a/app/views/auth/setup/show.html.haml
+++ b/app/views/auth/setup/show.html.haml
@@ -9,7 +9,7 @@
       %p.hint= t('auth.setup.email_below_hint_html')
 
     .fields-group
-      = f.input :email, required: true, hint: false, input_html: { 'aria-label' => t('simple_form.labels.defaults.email'), :autocomplete => 'off' }
+      = f.input :email, required: true, hint: false, input_html: { 'aria-label': t('simple_form.labels.defaults.email'), autocomplete: 'off' }
 
     .actions
       = f.submit t('admin.accounts.change_email.label'), class: 'button'
diff --git a/app/views/settings/deletes/show.html.haml b/app/views/settings/deletes/show.html.haml
index c08ee85b0..2e9785c89 100644
--- a/app/views/settings/deletes/show.html.haml
+++ b/app/views/settings/deletes/show.html.haml
@@ -21,9 +21,9 @@
   %hr.spacer/
 
   - if current_user.encrypted_password.present?
-    = f.input :password, wrapper: :with_block_label, input_html: { :autocomplete => 'current-password' }, hint: t('deletes.confirm_password')
+    = f.input :password, wrapper: :with_block_label, input_html: { autocomplete: 'current-password' }, hint: t('deletes.confirm_password')
   - else
-    = f.input :username, wrapper: :with_block_label, input_html: { :autocomplete => 'off' }, hint: t('deletes.confirm_username')
+    = f.input :username, wrapper: :with_block_label, input_html: { autocomplete: 'off' }, hint: t('deletes.confirm_username')
 
   .actions
     = f.button :button, t('deletes.proceed'), type: :submit, class: 'negative'
diff --git a/app/views/settings/migration/redirects/new.html.haml b/app/views/settings/migration/redirects/new.html.haml
index d7868e900..370087879 100644
--- a/app/views/settings/migration/redirects/new.html.haml
+++ b/app/views/settings/migration/redirects/new.html.haml
@@ -19,9 +19,9 @@
 
     .fields-row__column.fields-group.fields-row__column-6
       - if current_user.encrypted_password.present?
-        = f.input :current_password, wrapper: :with_block_label, input_html: { :autocomplete => 'current-password' }, required: true
+        = f.input :current_password, wrapper: :with_block_label, input_html: { autocomplete: 'current-password' }, required: true
       - else
-        = f.input :current_username, wrapper: :with_block_label, input_html: { :autocomplete => 'off' }, required: true
+        = f.input :current_username, wrapper: :with_block_label, input_html: { autocomplete: 'off' }, required: true
 
   .actions
     = f.button :button, t('migrations.set_redirect'), type: :submit, class: 'button button--destructive'
diff --git a/app/views/settings/migrations/show.html.haml b/app/views/settings/migrations/show.html.haml
index 1ecf7302a..31f7d5e58 100644
--- a/app/views/settings/migrations/show.html.haml
+++ b/app/views/settings/migrations/show.html.haml
@@ -48,9 +48,9 @@
 
     .fields-row__column.fields-group.fields-row__column-6
       - if current_user.encrypted_password.present?
-        = f.input :current_password, wrapper: :with_block_label, input_html: { :autocomplete => 'current-password' }, required: true, disabled: on_cooldown?
+        = f.input :current_password, wrapper: :with_block_label, input_html: { autocomplete: 'current-password' }, required: true, disabled: on_cooldown?
       - else
-        = f.input :current_username, wrapper: :with_block_label, input_html: { :autocomplete => 'off' }, required: true, disabled: on_cooldown?
+        = f.input :current_username, wrapper: :with_block_label, input_html: { autocomplete: 'off' }, required: true, disabled: on_cooldown?
 
   .actions
     = f.button :button, t('migrations.proceed_with_move'), type: :submit, class: 'button button--destructive', disabled: on_cooldown?
diff --git a/app/views/settings/two_factor_authentication/confirmations/new.html.haml b/app/views/settings/two_factor_authentication/confirmations/new.html.haml
index 671237db5..43830ac27 100644
--- a/app/views/settings/two_factor_authentication/confirmations/new.html.haml
+++ b/app/views/settings/two_factor_authentication/confirmations/new.html.haml
@@ -12,7 +12,7 @@
       %samp.qr-alternative__code= @new_otp_secret.scan(/.{4}/).join(' ')
 
   .fields-group
-    = f.input :otp_attempt, wrapper: :with_label, hint: t('otp_authentication.code_hint'), label: t('simple_form.labels.defaults.otp_attempt'), input_html: { :autocomplete => 'off' }, required: true
+    = f.input :otp_attempt, wrapper: :with_label, hint: t('otp_authentication.code_hint'), label: t('simple_form.labels.defaults.otp_attempt'), input_html: { autocomplete: 'off' }, required: true
 
   .actions
     = f.button :button, t('otp_authentication.enable'), type: :submit
diff --git a/app/views/settings/two_factor_authentication/webauthn_credentials/new.html.haml b/app/views/settings/two_factor_authentication/webauthn_credentials/new.html.haml
index 1148d5ed7..5e9d22571 100644
--- a/app/views/settings/two_factor_authentication/webauthn_credentials/new.html.haml
+++ b/app/views/settings/two_factor_authentication/webauthn_credentials/new.html.haml
@@ -8,7 +8,7 @@
   %p.hint= t('webauthn_credentials.description_html')
 
   .fields_group
-    = f.input :nickname, wrapper: :with_block_label, hint: t('webauthn_credentials.nickname_hint'), input_html: { :autocomplete => 'off' }, required: true
+    = f.input :nickname, wrapper: :with_block_label, hint: t('webauthn_credentials.nickname_hint'), input_html: { autocomplete: 'off' }, required: true
 
   .actions
     = f.button :button, t('webauthn_credentials.add'), class: 'js-webauthn', type: :submit
diff --git a/app/views/statuses/_detailed_status.html.haml b/app/views/statuses/_detailed_status.html.haml
index 619406d89..bf498e33d 100644
--- a/app/views/statuses/_detailed_status.html.haml
+++ b/app/views/statuses/_detailed_status.html.haml
@@ -15,12 +15,12 @@
 
   = account_action_button(status.account)
 
-  .status__content.emojify{ :data => ({ spoiler: current_account&.user&.setting_expand_spoilers ? 'expanded' : 'folded' } if status.spoiler_text?) }<
+  .status__content.emojify{ data: ({ spoiler: current_account&.user&.setting_expand_spoilers ? 'expanded' : 'folded' } if status.spoiler_text?) }<
     - if status.spoiler_text?
       %p<
         %span.p-summary> #{prerender_custom_emojis(h(status.spoiler_text), status.emojis)}&nbsp;
         %button.status__content__spoiler-link= t('statuses.show_more')
-    .e-content{ :lang => status.language }
+    .e-content{ lang: status.language }
       = prerender_custom_emojis(status_content_format(status), status.emojis)
 
       - if status.preloadable_poll
diff --git a/app/views/statuses/_simple_status.html.haml b/app/views/statuses/_simple_status.html.haml
index bfde3a260..32584c92a 100644
--- a/app/views/statuses/_simple_status.html.haml
+++ b/app/views/statuses/_simple_status.html.haml
@@ -27,12 +27,12 @@
           %span.display-name__account
             = acct(status.account)
             = fa_icon('lock') if status.account.locked?
-  .status__content.emojify{ :data => ({ spoiler: current_account&.user&.setting_expand_spoilers ? 'expanded' : 'folded' } if status.spoiler_text?) }<
+  .status__content.emojify{ data: ({ spoiler: current_account&.user&.setting_expand_spoilers ? 'expanded' : 'folded' } if status.spoiler_text?) }<
     - if status.spoiler_text?
       %p<
         %span.p-summary> #{prerender_custom_emojis(h(status.spoiler_text), status.emojis)}&nbsp;
         %button.status__content__spoiler-link= t('statuses.show_more')
-    .e-content{ :lang => status.language }
+    .e-content{ lang: status.language }
       = prerender_custom_emojis(status_content_format(status), status.emojis)
 
       - if status.preloadable_poll
diff --git a/config/environments/production.rb b/config/environments/production.rb
index dc5319535..5ea9ea9ba 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -116,18 +116,18 @@ Rails.application.configure do
   end
 
   config.action_mailer.smtp_settings = {
-    :port                 => ENV['SMTP_PORT'],
-    :address              => ENV['SMTP_SERVER'],
-    :user_name            => ENV['SMTP_LOGIN'].presence,
-    :password             => ENV['SMTP_PASSWORD'].presence,
-    :domain               => ENV['SMTP_DOMAIN'] || ENV['LOCAL_DOMAIN'],
-    :authentication       => ENV['SMTP_AUTH_METHOD'] == 'none' ? nil : ENV['SMTP_AUTH_METHOD'] || :plain,
-    :ca_file              => ENV['SMTP_CA_FILE'].presence || '/etc/ssl/certs/ca-certificates.crt',
-    :openssl_verify_mode  => ENV['SMTP_OPENSSL_VERIFY_MODE'],
-    :enable_starttls      => enable_starttls,
-    :enable_starttls_auto => enable_starttls_auto,
-    :tls                  => ENV['SMTP_TLS'].presence && ENV['SMTP_TLS'] == 'true',
-    :ssl                  => ENV['SMTP_SSL'].presence && ENV['SMTP_SSL'] == 'true',
+    port: ENV['SMTP_PORT'],
+    address: ENV['SMTP_SERVER'],
+    user_name: ENV['SMTP_LOGIN'].presence,
+    password: ENV['SMTP_PASSWORD'].presence,
+    domain: ENV['SMTP_DOMAIN'] || ENV['LOCAL_DOMAIN'],
+    authentication: ENV['SMTP_AUTH_METHOD'] == 'none' ? nil : ENV['SMTP_AUTH_METHOD'] || :plain,
+    ca_file: ENV['SMTP_CA_FILE'].presence || '/etc/ssl/certs/ca-certificates.crt',
+    openssl_verify_mode: ENV['SMTP_OPENSSL_VERIFY_MODE'],
+    enable_starttls: enable_starttls,
+    enable_starttls_auto: enable_starttls_auto,
+    tls: ENV['SMTP_TLS'].presence && ENV['SMTP_TLS'] == 'true',
+    ssl: ENV['SMTP_SSL'].presence && ENV['SMTP_SSL'] == 'true',
   }
 
   config.action_mailer.delivery_method = ENV.fetch('SMTP_DELIVERY_METHOD', 'smtp').to_sym
diff --git a/spec/controllers/admin/statuses_controller_spec.rb b/spec/controllers/admin/statuses_controller_spec.rb
index 227688e23..7f912c1c0 100644
--- a/spec/controllers/admin/statuses_controller_spec.rb
+++ b/spec/controllers/admin/statuses_controller_spec.rb
@@ -41,7 +41,7 @@ describe Admin::StatusesController do
 
   describe 'POST #batch' do
     before do
-      post :batch, params: { :account_id => account.id, action => '', :admin_status_batch_action => { status_ids: status_ids } }
+      post :batch, params: { account_id: account.id, action => '', admin_status_batch_action: { status_ids: status_ids } }
     end
 
     let(:status_ids) { [media_attached_status.id] }
diff --git a/spec/services/favourite_service_spec.rb b/spec/services/favourite_service_spec.rb
index 94a8111dd..9781f0d78 100644
--- a/spec/services/favourite_service_spec.rb
+++ b/spec/services/favourite_service_spec.rb
@@ -23,7 +23,7 @@ RSpec.describe FavouriteService, type: :service do
     let(:status) { Fabricate(:status, account: bob) }
 
     before do
-      stub_request(:post, "http://example.com/inbox").to_return(:status => 200, :body => "", :headers => {})
+      stub_request(:post, "http://example.com/inbox").to_return(status: 200, body: "", headers: {})
       subject.call(sender, status)
     end
 
diff --git a/spec/services/follow_service_spec.rb b/spec/services/follow_service_spec.rb
index 88346ec54..412c04d76 100644
--- a/spec/services/follow_service_spec.rb
+++ b/spec/services/follow_service_spec.rb
@@ -140,7 +140,7 @@ RSpec.describe FollowService, type: :service do
     let(:bob) { Fabricate(:account, username: 'bob', domain: 'example.com', protocol: :activitypub, inbox_url: 'http://example.com/inbox') }
 
     before do
-      stub_request(:post, "http://example.com/inbox").to_return(:status => 200, :body => "", :headers => {})
+      stub_request(:post, "http://example.com/inbox").to_return(status: 200, body: "", headers: {})
       subject.call(sender, bob)
     end
 
diff --git a/spec/views/statuses/show.html.haml_spec.rb b/spec/views/statuses/show.html.haml_spec.rb
index eeea2f698..ca5bb2ae8 100644
--- a/spec/views/statuses/show.html.haml_spec.rb
+++ b/spec/views/statuses/show.html.haml_spec.rb
@@ -4,7 +4,7 @@ require 'rails_helper'
 
 describe 'statuses/show.html.haml', without_verify_partial_doubles: true do
   before do
-    double(:api_oembed_url => '')
+    double(api_oembed_url: '')
     allow(view).to receive(:show_landing_strip?).and_return(true)
     allow(view).to receive(:site_title).and_return('example site')
     allow(view).to receive(:site_hostname).and_return('example.com')