Hello,
This is something we will be happy to look into since Plesk was installed by us. Please create a ticket by sending a email to
vps@lunarpages.com or raise this recurring issue in the dedicatedchat.
To modify /etc/xinetd.d/popa3d, you need to ssh in the server as root. Open the file in a editor, i.e.
nano /etc/xinetd.d/popa3d
Make the necessary changes, save the file and restart xinetd to accept the new configuration:
/etc/init.d/xinetd restart
I hope this helps.