rogv24@yahoo.com wrote:

> reject_unknown_sender_domain is not rejecting. can anyone assist in this.



reject_unknown_sender_domain belongs under smtpd_sender_restrictions and
not smtpd_recipient_restrictions. You need to break things out underneath the
appropriate restrictions class. For example:

smtpd_client_restrictions =
permit_mynetworks,
check_client_access dbm:$config_directory/access,
reject_rbl_client list.dsbl.org,
reject_rbl_client relays.ordb.org,
reject_rbl_client bl.spamcop.net,
reject_unauth_pipelining

smtpd_helo_restrictions = check_helo_access dbm:$config_directory/helo_access.
reject_non_fqdn_hostname,
reject_invalid_hostname

smtpd_recipient_restrictions =
check_recipient_access dbm:$config_directory/recipient_access,
reject_non_fqdn_recipient,
reject_unauth_destination,
reject_unknown_sender_domain

smtpd_sender_restrictions = reject_non_fqdn_sender,
check_sender_access dbm:$config_directory/spammers,
check_sender_access dbm:$config_directory/junk,
check_sender_access dbm:$config_directory/freemail_access,
permit_mynetworks,
reject_unknown_sender_domain,
permit

Reference: man 5 postconf

--
Greg