Postfix RBL / MTA level drop spam prior to it hitting spamassassin

This is the config I use to drop spam – paste this to the bottom of your main.cf:

disable_vrfy_command = yes
smtpd_delay_reject = yes
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks,
reject_non_fqdn_hostname,
reject_invalid_hostname,
permit
smtpd_recipient_restrictions = permit_mynetworks,reject_unauth_destination
reject_rbl_client list.dsbl.org,
reject_rbl_client sbl.spamhaus.org,
reject_rbl_client cbl.abuseat.org,
reject_rbl_client dul.dnsbl.sorbs.net,
smtpd_error_sleep_time = 1s
smtpd_soft_error_limit = 10
smtpd_hard_error_limit = 20

A recommended read for anyone who works in ICT in education

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Be your role technical or leadership it is always important to be influenced and to share ideas.  One man, and only one man has made this possible by gathering examples of projects run by schools and compiling them into an easy to read Book.

I recommend those working in Primary Education read pages 14-48 closely and try hard not to be inspired by the work other schools are doing in this area.

Here is a link to the book and here is a link to the Author – Terry Freedman