опыт работы с проверкой на существовние адреса в постфиксе?

maps_rbl_domains =
        relays.ordb.org
        list.dsbl.org
        opm.blitzed.org
        sbl.spamhaus.org
        cbl.abuseat.org
        dnsbl.sorbs.net
smtpd_recipient_restrictions =
        reject_non_fqdn_sender
        reject_non_fqdn_recipient
        reject_unknown_recipient_domain
        reject_unauth_pipelining
        permit_mynetworks
        reject_unknown_sender_domain
        reject_invalid_hostname
        reject_non_fqdn_hostname
        reject_unauth_destination
        reject_maps_rbl
        check_relay_domains


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