diff --git a/app/mailers/maintenance_mailer.rb b/app/mailers/maintenance_mailer.rb
index 2f2a3d6..adfabe7 100644
--- a/app/mailers/maintenance_mailer.rb
+++ b/app/mailers/maintenance_mailer.rb
@@ -14,13 +14,9 @@ class MaintenanceMailer < ApplicationMailer
 
   # Notifica que volvimos
   def were_back
-    params[:maintenance] = Maintenance.find(params[:maintenance_id])
-
-    Usuarie.all.find_each do |usuarie|
-      I18n.with_locale usuarie.lang do
-        mail to: usuarie.email,
-             subject: I18n.t('maintenance_mailer.were_back.subject')
-      end
+    I18n.with_locale params[:lang] do
+      mail to: params[:email],
+           subject: I18n.t('maintenance_mailer.were_back.subject')
     end
   end
 
diff --git a/app/models/maintenance.rb b/app/models/maintenance.rb
index a40d5cc..95b2a01 100644
--- a/app/models/maintenance.rb
+++ b/app/models/maintenance.rb
@@ -5,4 +5,50 @@ class Maintenance < ApplicationRecord
   extend Mobility
 
   translates :message, type: :string, locale_accessors: true
+
+  # Renderiza el mensaje una sola vez
+  #
+  # @return [String]
+  def to_html
+    @renderized_message ||= {}
+    @renderized_message[message.hash.to_s] ||= CommonMarker.render_doc(message, %i[FOOTNOTES SMART], %i[table strikethrough autolink]).to_html.html_safe
+  end
+
+  # Como no sabemos en qué zona horaria están les usuaries, generamos la
+  # URL para convertir el tiempo estimado a la zona local, visitando
+  # otro servicio.
+  #
+  # @return [String]
+  def estimated_from_time_is
+    @estimated_from_time_is ||= {}
+    @estimated_from_time_is[cache_key_for_attr(estimated_from)] ||= time_is(estimated_from)
+  end
+
+  # @see estimated_from_time_is
+  # @return [String]
+  def estimated_to_time_is
+    @estimated_to_time_is ||= {}
+    @estimated_to_time_is[cache_key_for_attr(estimated_to)] ||= time_is(estimated_to)
+  end
+
+  # @see estimated_from_time_is
+  # @return [String]
+  def updated_at_time_is
+    @updated_at_time_is ||= {}
+    @updated_at_time_is[cache_key_for_attr(updated_at)] ||= time_is(updated_at)
+  end
+
+  private
+
+  def cache_key_for_attr(attr)
+    attr.hash.to_s + I18n.locale.to_s
+  end
+
+  # Devuelve la URL
+  #
+  # @param [Time]
+  # @return [String]
+  def time_is(time)
+    "https://time.is/#{I18n.locale}/compare/#{time.utc.strftime('%H%M_%d_%B_%Y_in_%Z')}"
+  end
 end
diff --git a/app/views/maintenance_mailer/notice.html.haml b/app/views/maintenance_mailer/notice.html.haml
index 667002b..d159db6 100644
--- a/app/views/maintenance_mailer/notice.html.haml
+++ b/app/views/maintenance_mailer/notice.html.haml
@@ -1,6 +1,6 @@
 %p= t('.hi')
 %p= t('.message')
 %p= t('.reason')
-%blockquote= params[:maintenance].message
-%p= t('.estimated_from', from: params[:maintenance].estimated_from)
-%p= t('.estimated_to', to: params[:maintenance].estimated_to)
+= params[:maintenance].to_html
+%p= t('.estimated_from_html', from: params[:maintenance].estimated_from, time_is: params[:maintenance].estimated_from_time_is)
+%p= t('.estimated_to_html', to: params[:maintenance].estimated_to, time_is: params[:maintenance].estimated_to_time_is)
diff --git a/app/views/maintenance_mailer/notice.text.haml b/app/views/maintenance_mailer/notice.text.haml
index 7e8c5f3..1767d0d 100644
--- a/app/views/maintenance_mailer/notice.text.haml
+++ b/app/views/maintenance_mailer/notice.text.haml
@@ -6,7 +6,7 @@
 \
 = params[:maintenance].message.html_safe
 \
-= t('.estimated_from', from: params[:maintenance].estimated_from).html_safe
+= t('.estimated_from', from: params[:maintenance].estimated_from, time_is: params[:maintenance].estimated_from_time_is).html_safe
 \
-= t('.estimated_to', to: params[:maintenance].estimated_to).html_safe
+= t('.estimated_to', to: params[:maintenance].estimated_to, time_is: params[:maintenance].estimated_to_time_is).html_safe
 \
diff --git a/app/views/maintenance_mailer/were_back.html.haml b/app/views/maintenance_mailer/were_back.html.haml
index 20d0bf2..0bff7ef 100644
--- a/app/views/maintenance_mailer/were_back.html.haml
+++ b/app/views/maintenance_mailer/were_back.html.haml
@@ -1,3 +1,3 @@
 %p= t('.hi')
-%p= t('.message')
-%blockquote= params[:maintenance].message
+%p= t('.message_html', updated_at: params[:maintenance].updated_at, time_is: params[:maintenance].updated_at_time_is)
+%p= params[:maintenance].to_html
diff --git a/app/views/maintenance_mailer/were_back.text.haml b/app/views/maintenance_mailer/were_back.text.haml
index 5d7d531..db6dfb4 100644
--- a/app/views/maintenance_mailer/were_back.text.haml
+++ b/app/views/maintenance_mailer/were_back.text.haml
@@ -1,6 +1,6 @@
 = t('.hi')
 \
-= t('.message')
+= t('.message', updated_at: params[:maintenance].updated_at, time_is: params[:maintenance].updated_at_time_is)
 \
 = params[:maintenance].message
 \
diff --git a/config/locales/en.yml b/config/locales/en.yml
index f9e8050..f5b254e 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -94,13 +94,16 @@ en:
       hi: 'Hi!'
       message: "We're getting in contact with you to let you know we'll be doing maintenance work in our servers."
       reason: 'The reason is:'
-      estimated_from: 'The maintenance period starts at %{from}'
-      estimated_to: 'Up to %{to} (approximately)'
+      estimated_from: 'The maintenance period starts at %{from} (visit %{time_is} to convert into your time zone)'
+      estimated_to: 'Up to %{to} (approximately, visit %{time_is} to convert into your time zone)'
+      estimated_from_html: 'The maintenance period starts at %{from} <a referrerpolicy="no-referrer" href="%{time_is}" target="_blank" rel="nofollow">(convert into your time zone)</a>'
+      estimated_to_html: 'Up to %{to} (approximately, <a referrerpolicy="no-referrer" href="%{time_is}" target="_blank" rel="nofollow">convert into your time zone</a>)'
       thanks: 'Thanks for your patience'
     were_back:
       subject: 'Maintenance period ended'
       hi: 'Hi!'
-      message: 'The maintenance period ended at %{created_at}'
+      message: 'The maintenance period ended at %{updated_at} (visit %{time_is} to convert into your time zone)'
+      message_html: 'The maintenance period ended at %{updated_at} <a referrerpolicy="no-referrer" href="%{time_is}" target="_blank" rel="nofollow">(convert into your timezone)</a>'
     ics:
       summary: 'Sutty - Maintenance'
   activerecord:
diff --git a/config/locales/es.yml b/config/locales/es.yml
index 729e9fd..b68c6a8 100644
--- a/config/locales/es.yml
+++ b/config/locales/es.yml
@@ -94,13 +94,16 @@ es:
       hi: '¡Hola!'
       message: 'Nos comunicamos con vos para informarte que estaremos realizando mantenimiento en nuestros servidores'
       reason: 'La razón de esta tarea es:'
-      estimated_from: 'El mantenimiento se realizará a partir de %{from}'
-      estimated_to: 'Hasta %{to} (aproximadamente)'
+      estimated_from: 'El mantenimiento se realizará a partir de %{from} (%{time_is})'
+      estimated_to: 'Hasta %{to} (aproximadamente, %{time_is})'
+      estimated_from_html: 'El mantenimiento se realizará a partir de %{from} <a referrerpolicy="no-referrer" href="%{time_is}" target="_blank" rel="nofollow">(convertir a tu zona horaria).</a>'
+      estimated_to_html: 'Hasta %{to} (aproximadamente, <a href="%{time_is}" referrerpolicy="no-referrer" target="_blank" rel="nofollow">convertir a tu zona horaria</a>)'
       thanks: 'Gracias por tu paciencia'
     were_back:
       subject: 'Fin del mantenimiento'
       hi: '¡Hola!'
-      message: 'El período de mantenimiento terminó en %{created_at}'
+      message: 'El período de mantenimiento terminó en %{updated_at} (visita %{time_is} para convertir a tu zona horaria)'
+      message_html: 'El período de mantenimiento terminó en %{updated_at} <a referrerpolicy="no-referrer" href="%{time_is}" target="_blank" rel="nofollow">(convertir a tu zona horaria)</a>'
     ics:
       summary: 'Sutty - Mantenimiento'
   activerecord: