check
pico /etc/warnquota.conf
QUOTE
# but they don't have to be:
#
SUBJECT = NOTE: You are exceeding your allocatted disk space limits
CC_TO = "root@localhost"
SUPPORT = "root@myhost.com"
PHONE = "(123) 456-1111 or (222) 333-4444"
# Text in the beginning of the mail (if not specified, default text is used)
# This way text can be split to more lines
# Line break are done by '|' character
#
MESSAGE = Your disk usage has exceeded the agreeded limits
on this server|Please delete any unnecessary files on following filesystems:|
# Text in the end of the mail (if not specified, default text using SUPPORT and PHONE
# is created)
#
SIGNATURE = root@localhost