03-14-2010
You did block/stop/delete whatever caused the one account to become a spambot, right? Othwerise the problem will spread to other user accounts. And this answer becomnes pointless.
You can employ setfacl to block execute access for the sendmail image for use by one specific username. I would completely disable that account, and move it to the nobody group if you have one. I would also question any file that user had write acces to. Then give the user another, new account.
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LEARN ABOUT REDHAT
userdel
USERDEL(8) System Manager's Manual USERDEL(8)
NAME
userdel - Delete a user account and related files
SYNOPSIS
userdel [-r] login
DESCRIPTION
The userdel command modifies the system account files, deleting all entries that refer to login. The named user must exist. The options
which apply to the userdel command are:
-r Files in the user's home directory will be removed along with the home directory itself and the user's mail spool. Files located in
other file systems will have to be searched for and deleted manually.
FILES
/etc/passwd - user account information
/etc/shadow - secure user account information
/etc/group - group information
CAVEATS
userdel will not allow you to remove an account if the user is currently logged in. You must kill any running processes which belong to an
account that you are deleting. You may not remove any NIS attributes on an NIS client. This must be performed on the NIS server.
SEE ALSO
chfn(1), chsh(1), passwd(1), groupadd(8), groupdel(8), groupmod(8), useradd(8), usermod(8)
AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com)
USERDEL(8)