Using certain cPanel features that directly relate or depend on mail functionality may report failures that may share a similar error:
/usr/bin/doveadm” reported error code “68”
This message failure is reported by Dovecot when it failed to locate a mailbox. This can either be related to a unique mailbox directory being missing or the entire email address missing necessary files.
We have a few helpful resources that related to similar issues as this.
Should these articles not be helpful, or the failure is not obvious, feel free to contact us!