Recently, I setup magento 18.104.22.168 staging environment in AWS, site is working without any problem except Order confirmation mails, when i avoid cron, mails are sending but when i use cron mails are not sending. aoe-scheduler is enabled, cron (scheduled tasks) are set, heartbeat task schedule is set to every 5 minutes. All the settings in admin panel are similar to live environment,
Does anyone know how to solve this issue ? i dont want to avoid cron.