Hey All! I use the virtual user setup posted in the howtos here. I recently decided to add RBL and bounce filtering to my setup. I added this to my main.cf: Code: receive_override_options = no_address_mappings smtpd_helo_required = yes strip_rfc821_envelopes = yes disable_vrfy_command = yes unknown_address_reject_code = 554 unknown_hostname_reject_code = 554 unknown_client_reject_code = 554 smtpd_helo_restrictions = permit_mynetworks, reject_invalid_hostname, regexp:/etc/postfix/helo.regexp, permit smtpd_recipient_restrictions = check_client_access hash:/etc/postfix/helo_client_exceptions, check_sender_access hash:/etc/postfix/sender_checks, reject_invalid_hostname, reject_non_fqdn_sender, reject_non_fqdn_recipient, reject_unknown_sender_domain, reject_unknown_recipient_domain, permit_mynetworks, reject_unauth_destination, permit_sasl_authenticated, check_client_access hash:/etc/postfix/rbl_client_exceptions, reject_rbl_client cbl.abuseat.org, reject_rbl_client sbl.spamhaus.org, reject_rbl_client xbl.spamhaus.org, reject_rbl_client bl.spamcop.net, reject_rhsbl_sender dsn.rfc-ignorant.org, permit default_rbl_reply = $rbl_code Service unavailable; $rbl_class [$rbl_what] blocked using $rbl_domain${rbl_reason?; $rbl_reason} header_checks = regexp:/etc/postfix/header_checks body_checks = regexp:/etc/postfix/body_checks However now my sasl_authenticated users are getting a relay denied error message. Can anyone help?