CAn I delete the files inside the /opt/trend/virus ????

Please!!!! Can someone reply?

THANKS

I don't have /opt/trend/virus
But you probably don't want to go around manually deleting files, instead try removing them from the way they were installed (rpm -e most likely).

As for "it seems to not work out" what do you mean? Do you mean you aren't gaining any space from removing these applications? Is it possible that you already deleted alot of these hogs, and when you remove the applications you are just removing the reminance of applications already long gone?

If you aren't running a major mail server, your best bet is going to be to wipe the slate clean, re-partition, this time only using a single partition, backup the essentials and this time only put the email server necessary tools on there.

Cool

I have backup the files on /opt/trend/virus and have done deleting files on it. But still we cant receive emails... Could the problem is on Postfix (yesterday we have deleted manually the /var)???

Knowing that the said action has no effect on the mail, I bring back what I removed a while ago (/opt/trend/virus) to its original place.

You think the config of the mail is the problem??? How will I solve it?

When you removed/put back /var it changed all the permissions on /var to root only. This is not satisfactory for human use (though it is very secure ). Either you can re-install/upgrade your postfix install, during this install/upgrade correct permissions will be set;
OR
you can go through manually, and redo all the permissions according to your Makefile from compiling Postfix.

Best option IMHO, re-install Postfix. However, this won't be the only thing needing re-installing most likely. You will have other permissions issues on the system, other files need other permissions too...
For this you can decide how to proceed, a re-install might be necessary However, you might be able to get by with just a postfix re-install/upgrade.

FYI:
In the future, when you backup/remove directories/files, ensure the permissions are preserved.

Cool