A big ISP here in Austria started to use reject_unknown_client_hostname (http://www.postfix.org/postconf.5.html#reject_unknown_client_hostname) also known as http://en.wikipedia.org/wiki/Forward_Confirmed_reverse_DNS
Is this option safe today? About 2 years ago it was not, rejecting lots of good mails. In terms of anti-spam, I'd love to use it, as it should really help drop a lot of zombie PC's mails in a simple manner. But I'd like to hear opinions or experience of others. Thank you. mfg zmi -- // Michael Monnerie, Ing.BSc ----- http://it-management.at // Tel: 0660 / 415 65 31 .network.your.ideas. // PGP Key: "curl -s http://zmi.at/zmi.asc | gpg --import" // Fingerprint: AC19 F9D5 36ED CD8A EF38 500E CE14 91F7 1C12 09B4 // Keyserver: wwwkeys.eu.pgp.net Key-ID: 1C1209B4
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