In sme server we have some email aliases defined as visible=internal, that is internal users (relayclients) could write to them, but from outside the lan (non relay clients) the email address is not reachable (non existent).
(http://github.com/filippocarletti/qpsmtpd/blob/0c8c3fbd4a79d4ef3536ff90e3bb1595bbad0fe9/packaging/rpm/files/qpsmtpd-0.40-badrcptto_allowrelay.patch) --- qpsmtpd-0.40/plugins/check_badrcptto.badrcptto_allowrelay 2007-06-14 11:57:24.000000000 -0600 +++ qpsmtpd-0.40/plugins/check_badrcptto 2007-06-14 13:26:42.000000000 -0600 @@ -3,6 +3,7 @@ sub hook_rcpt { my ($self, $transaction, $recipient, %param) = @_; + return (DECLINED) if $self->qp->connection->relay_client; my @badrcptto = $self->qp->config("badrcptto") or return (DECLINED); return (DECLINED) unless $recipient->host && $recipient->user; my $host = lc $recipient->host; -- Ciao, Filippo
