I can't, it's not a server for personal use. Please can I receive support without providing login credentials?
Can't add domain on mail server
aaP_vini
Reinstalling can't solve it, this needs to be checked by the developer.
please do we have any solution? something i can do? I can not give access to the server. I can harm myself.. 
How do I uninstall it completely without leaving any traces on the email server? So I can reinstall in a pure way.
aaP_vini
After uninstalling the mail server, move the /www/vmail directory: mv /www/vmail /www/vmail_bak
aaPanel_Kern It works, my dear. Thank you very much! Problem finally solved with complete uninstall. 
19 days later
how can i solve this??
aaP_olaniyi
Hello, please paste all the errors or take a screenshot
a month later
This problem came back
7 days later
aaP_vini
Solved by installing aapanel on "centos 7" and "negix" ... using "Ubuntu" can cause this problem
a month later
i have the same probleme in centos and ngnix
vodzilla
Hello, please take a screenshot of the error or provide more detailed information
vodzilla
Hello, please check whether the records of A and mx are normal? Resolution points to the IP of the server, and cannot use a proxy.