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Postfix blacklist
This is a discussion on Postfix blacklist within the Mail Servers forums, part of the Mastering Servers category; I'd like to protect users from spam (UCE) using Postfix blacklist feature. Can any one describes methods that postfix provides ...
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06-21-2007, 12:43 AM
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Postfix blacklist
I'd like to protect users from spam (UCE) using Postfix blacklist feature. Can any one describes methods that postfix provides for the e-mail administrator to filter known spam sites and messages.
I want config for Relay control, junk mail control, and per-user policies etc TIA 
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07-26-2007, 03:41 PM
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You can blacklist domains, IPs, IP blocks and hosts through regexp.
/etc/postfix/main.cf: Code:
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination etc.... check_client_access regexp:/etc/postfix/blacklist_clients etc.. permit Code:
# IP /^10\.10\.1\.2$/ REJECT UCE black-listed # IP block /^10\.10\.1/ REJECT UCE black-listed # exact domain /^example\.com$/ REJECT UCE black-listed # everything in a domain /example\.com$/ REJECT UCE black-listed # specific hosts /^uce-relay\.example\.com$/ REJECT UCE black-listed The best you can do is integrate postgrey, amavisd-new, spamassassin and clamav to make things easier for you and automatic. Postgrey would delay temporarily incoming mails to prevent zombies send their spam and while amavisd-new, spamassassin and clamav would check the messages and bring to quarantine junk ones. Then from your quarantine, which I'm doing, I'm getting the lists of spam relay MTA/hosts to be listed in my regexp. Also by adding the following simple parameters in your main.cf could reject several spam senders: Code:
smtpd_helo_required = yes
smtpd_helo_restrictions =
permit_mynetworks
permit_sasl_authenticated
reject_invalid_hostname
reject_non_fqdn_hostname
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07-27-2007, 06:55 AM
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Thanks a lot!
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