Constant connections from user unknown sending spam

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Constant connections from user unknown sending ...
\ Kevin Brown (21 Jul 2007)
. \ MrC (21 Jul 2007)
. \ MrC (21 Jul 2007)

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Subject:	Constant connections from user unknown sending spam
Group:	Postfix-users
From:	Kevin Brown
Date:	21 Jul 2007

I addded the lines with regard to require helo and thse lines at the end
of /etc/postfix/main.cf

#Something Kevin added
reject_unknown_client = yes
smtpd_delay_reject = yes
smtpd_helo_required = yes

But don't seem to be working.
I run fedora 4 with postfix, spamassassin and clamav, amavis packages.
Just my little dsl box.

[root@xkmail ~]# postconf -n
alias_database = hash:/etc/postfix/aliases
alias_maps = hash:/etc/postfix/aliases
bounce_queue_lifetime = 6h
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = mailprefilter
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
html_directory = no
local_recipient_maps =
luser_relay =
mailbox_size_limit = 102400000
mailbox_transport = mailpostfilter
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
message_size_limit = 102400000
message_strip_characters = \0
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mynetworks = 127.0.0.0/8, 192.168.1.0/24
newaliases_path = /usr/bin/newaliases.postfix
recipient_delimiter = +
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtpd_delay_reject = yes
smtpd_helo_required = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,
permit_mynetworks, reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $mydomain
smtpd_sasl_security_options = noanonymous
smtpd_tls_cert_file = /etc/postfix/cert.pem
smtpd_tls_key_file = /etc/postfix/key.pem
smtpd_tls_loglevel = 1
smtpd_use_tls = yes
transport_maps = hash:/etc/postfix/transport
unknown_local_recipient_reject_code = 550