all websites on cyberpanel cannot accept email.

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

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.

having same issues. Postfix configs are not setup properly by the panel installation script. But they are too complicated to setup them my self. If some one has a working mail server please share your configs for Postfix!!