Operating System & Version
CentOS 7.9
cPanel & WHM Version
v98.0.10

cPanelAnthony

Administrator
Staff member
Oct 18, 2021
580
53
103
Houston, TX
cPanel Access Level
Root Administrator
Hello! We would need to investigate to determine why it's saying the mailnull user doesn't exist. Would you be able to open a support ticket using the link in my signature, or request for your provider to open a ticket with cPanel for this issue? Once done, update us with the ticket ID so I can keep this thread updated on the findings.