chore(email): add an observer which log the emails dispatched

app/models/email_event.rb

@@ -15,4 +15,31 @@ class EmailEvent < ApplicationRecord
   enum status: {
     dispatched: 'dispatched'
   }
+  class << self
+    def create_from_message!(message, status:)
+      message.to.each do |recipient|
+        EmailEvent.create!(
+          to: pseudonymize_email(recipient),
+          subject: message.subject,
+          processed_at: message.date,
+          method: ActionMailer::Base.delivery_methods.key(message.delivery_method.class),
+          status:
+        )
+      rescue StandardError => error
+        Sentry.capture_exception(error, extra: { subject: message.subject, status: })
+      end
+    end
+
+    def pseudonymize_email(email)
+      username, domain_name = email.split("@")
+
+      username_masked = if username.length > 3
+        username[0..1] + "*" * (username.length - 3) + username[-1]
+      else
+        "*" * username.length
+      end
+
+      "#{username_masked}@#{domain_name}"
+    end
+  end
 end