On Wed, 2005-08-17 at 10:25 -0700, Jim B wrote:
> How can postfix be configured so that postfix will do a reverse dns on
> incoming mail and if it fails then the mail will not be accepted or
> will be discarded?
----
fwiw - a long discussion of postfix several months back resorted to my
putting this into postfix/main.cf - it has worked well...YMMV
### New rules gleaned from the following URL
#
http://jimsun.linxnet.com/misc/postfix-anti-UCE.txt
smtpd_helo_required = yes
disable_vrfy_command = yes
smtpd_recipient_restrictions =
permit_mynetworks,
reject_invalid_hostname,
reject_non_fqdn_hostname,
reject_non_fqdn_sender,
reject_non_fqdn_recipient,
reject_unknown_sender_domain,
reject_unknown_recipient_domain,
reject_unauth_destination,
check_helo_access hash:/etc/postfix/helo_checks,
check_sender_access hash:/etc/postfix/sender_checks,
check_client_access hash:/etc/postfix/client_checks,
reject_rbl_client relays.ordb.org,
reject_rbl_client opm.blitzed.org,
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,
permit
smtpd_data_restrictions =
reject_unauth_pipelining,
permit
Craig
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