Open tracking not working with Rails ahoy_email gem
问题 I am using ahoy_email gem in Rails and I am unable to make simple open tracking work, and I don't know how to debug it. The message record is being generated when email is sent: #<Ahoy::Message:0x000055592a4bd3a8 id: 1, token: "AVKoHmuT0OxqaQRpMfNoDjzD3ibUltHL", to: "augusto@qounter.com", user_type: "User", user_id: 6, mailer: "UserMailer#welcome_email", subject: "Bienvendido al Sistema de Facturación de Megacentro", sent_at: Thu, 30 Aug 2018 21:35:44 UTC +00:00, opened_at: nil, clicked_at: