/etc/warnquota.conf is in quota 4.01-8+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | ; ; and # type comments are allowed
# and even blank lines
# values can be quoted:
MAIL_CMD = "/usr/sbin/sendmail -t"
FROM = "root@localhost"
# but they don't have to be:
SUBJECT = Over quota
CC_TO = "root@localhost"
SUPPORT = "root@localhost"
PHONE = "<enter your phone number here>"
#
CHARSET = UTF-8
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