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Postfix smtpd_client_restrictions

Keeping known email abusers out is always desired. Postfix has a parameter which is specified in the main.cf file that allows you to refer to these lists. The script I use is as follows...

smtpd_client_restrictions =
	permit_mynetworks
	permit_sasl_authenticated
	reject_unauth_pipelining
	reject_rbl_client cbl.abuseat.org
	reject_rbl_client dnsbl.ahbl.org
	reject_rbl_client dnsbl.sorbs.net
	reject_rbl_client list.dsbl.org
	reject_rbl_client sbl-xbl.spamhaus.org
	#reject_rhsbl_client blackhole.securitysage.com
	reject_rhsbl_client rhsbl.sorbs.net
	permit

Note the commented out line

	#reject_rhsbl_client blackhole.securitysage.com

This is a list that was not properly administered. A friend of mine tried to email me who uses the mac.com domain and was being rejected as an abuser which, of course, is rediculous. I keep the entry as a future reference. There are others out there so if you know of them please let me know. mta.

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Email server software I also run my own postfix/dovecot email server. It's quick but requires regular technical tweaks to keep the spam at bay but, I love it. I built a ZIMBRA email server which was fun as it requires you to run your own DNS server. It all worked eventually but, I am short of spare hardware at the moment so will not be making full use of it until I need it. ZIMBRA email server is a full blown corporate email server system and handles spam very well. If you would like to know more then leave me a comment.