Email not working after CyberPanel Upgrade?

Note: This article is a work in process, will keep adding more information. If you have recently upgraded CyberPanel and your email stopped working then follow this guide to debug and possibly fix your email system. We recommend to upgrade

Email Queue Management in CyberPanel

In version v2.0.0, CyberPanel has introduced email queue management. This feature makes it easy for you to check the mails in queue, their status and provides you with the options to flush them again or delete individually or collectively. The