all websites on cyberpanel cannot receive emails, but can send emails. what is the problem? The MX domain is installed correctly.
when sent from another email, another email gets a message:
This is the mail system at host domainname.com.
I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.