Domenu sendera (cast za @ v adrese) mozes kontrolovat - ci je to FQDN a tiez ci existuje. Dalej sa mi celkom osvedcili dva rbl blacklisty - sbl-xbl.spamhaus.org a bl.spamcop.net.
Kód:
smtpd_recipient_restrictions =
        permit_mynetworks,
        permit_sasl_authenticated,
        reject_unauth_destination,
        reject_rbl_client sbl-xbl.spamhaus.org,
        reject_rbl_client bl.spamcop.net,
        reject_rbl_client relays.ordb.org,
        permit

smtpd_sender_restrictions =
        reject_non_fqdn_sender,
        reject_unknown_sender_domain,
        permit
Vyborna vec proti spamu je "reject_unknown_client_hostname", lenze hrozne vela normanych SMTP serverov je zle nakonfigurovanych a odmieta to potom od nich postu. Posfix 2.3 a novsi ma "reject_unknown_reverse_client_hostname" - to by sa asi dalo pouzit.
Normalne sa to pouziva takto:
Kód:
smtpd_client_restrictions =
       permit_mynetworks,
       reject_unknown_client,
       permit
permit_mynetworks zabezpeci, ze maily z lokalnej siete pojdu (inak by ludia neboli velmi nadseni )