Hi Guys. I recently setup postfix on my new server and have configured it to be rather strict when accepting mail. It has done wonders for reducing the amount of spam the server accepts. Ie, the volume of spam I now get has dropped to nearly zero without the need for tools like SpamAssassin. However legit mail is also being rejected. With good reason though, usually the sending host has fucked up DNS entries or is identifying itself with an invalid hostname during SMTP HELO/EHLO. Anyone else here use postfix? If so what are your smtpd_*_restrictions set to? Have you had to loosen your rules to allow valid mail sources that are badly configured though? What sort of policies do you have in place? What other alternatives to "reject_unknown_client" are there? Advice, help, suggestions most certainly welcome. Regards