Spam issues - ReadList.com

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Spam issues
\ Mac OS X Server Administrator (12 Jun 2007)
. \ Sandy Drobic (12 Jun 2007)
. . \ Mac OS X Server Administrator (12 Jun 2007)
. . . \ Sandy Drobic (12 Jun 2007)

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Subject:	Spam issues
Group:	Postfix-users
From:	Mac OS X Server Administrator
Date:	12 Jun 2007

After migrating from CommuniGate Pro 4.2.10 (w SpamAssassin 3.1.7) to
Postfix 2.1.5 (w SA 3.0.1), the amount of spam has increased substantially.
My question is 'is this due to Postfix misconfiguration, or the ineptitude
of the outdated SA?' (SA is clearly not flagging a lot of spam, but it seems
to me as if Postfix should be blocking more than it is...)

Some details from my main.cf:
content_filter = smtp-amavis:[127.0.0.1]:10024
smtpd_use_tls = yes
smtpd_sasl_auth_enable = yes
smtpd_use_pw_server = yes
disable_vrfy_command = yes
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_sasl_authenticated
,permit_mynetworks,check_helo_access hash:/etc/postfix/helo_access
,reject_non_fqdn_hostname,reject_invalid_hostname,permit
smtpd_recipient_restrictions = reject_invalid_hostname,reject
_non_fqdn_sender,reject_non_fqdn_recipient,reject_unlisted
_sender,reject_unknown_sender_domain,reject_unknown_recipien
t_domain,reject_unlisted_recipient,permit_mynetworks
,permit_sasl_authenticated,reject_unauth_destination,reject_rbl_client
zen.spamhaus.org,reject_rbl_client list.dsbl.org,permit
smtpd_data_restrictions = permit_mynetworks, reject_unauth_pipelining,
permit
smtpd_pw_server_security_options = cram-md5,gssapi,login
smtpd_enforce_tls = no
mydestination = $myhostname,localhost.$mydomain,localhost,
other.redacted.hosts
smtpd_client_restrictions =
maps_rbl_domains =
virtual_alias_maps = hash:/etc/postfix/virtual_alias
owner_request_special = no
alias_maps = hash:/etc/aliases,hash:/var/mailman/data/aliases