Hello All,
Couple questions. Appreciate your responses.

1. Is there any way to set anti spam settings just for incoming emails
to server? It is announce-only mailing list.  So, not much worried
about outgoing stuff for now.  We can change it later to check for
both ways if the reason arises so.

2. Here are settings I intent to use. Kindly suggest if you see any
risk to outgoing emails. We really don't want to try checking any
out-going emails.

Settings source :-
http://www.cyberciti.biz/tips/postfix-spam-filtering-with-blacklists-howto.html

==
disable_vrfy_command = yes
smtpd_delay_reject = yes
smtpd_helo_required = yes

smtpd_recipient_restrictions =
   permit_sasl_authenticated,
   reject_invalid_hostname,
   reject_non_fqdn_hostname,
   reject_non_fqdn_sender,
   reject_non_fqdn_recipient,
   reject_unknown_sender_domain,
   reject_unknown_recipient_domain,
   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_error_sleep_time = 1s
smtpd_soft_error_limit = 10
smtpd_hard_error_limit = 20
====

- Regards,
Bob.

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