[Greylist-users] Reject unknown user before greylisting the message (postfix)

[Cami]

> smtpd_recipient_restrictions =
>         permit_mynetworks,
>         permit_sasl_authenticated,
>         reject_unauth_destination,
>         reject_invalid_hostname,
>         reject_unauth_pipelining,
>         reject_non_fqdn_sender,
>         reject_unknown_sender_domain,
>         reject_non_fqdn_recipient,
>         reject_unknown_recipient_domain,
>         check_recipient_access hash:/etc/postfix/access,
>         reject_rhsbl_client blackhole.securitysage.com,
>         reject_rhsbl_sender blackhole.securitysage.com,
>         reject_rbl_client relays.ordb.org,
>         reject_rbl_client blackholes.easynet.nl,
>         reject_rbl_client cbl.abuseat.org,
>         reject_rbl_client proxies.blackholes.wirehub.net,
>         reject_rbl_client bl.spamcop.net,
>         reject_rbl_client sbl.spamhaus.org,
>         reject_rbl_client opm.blitzed.org,
>         reject_rbl_client dnsbl.njabl.org,
>         reject_rbl_client list.dsbl.org,
>         reject_rbl_client multihop.dsbl.org,
>         reject_rbl_client dnsbl.sorbs.net,

           reject_unlisted_recipient,  <------

>         check_policy_service unix:private/policy,
>         permit

Thats what you are after.

Cami