They say Postfix is NOT an open relay out-of-the-box. I believer them because it won't work for you out-of-the-box. But when I configured it to use my own hostname, domain, and network address, it was declared an open relay by 2 blacklists after a few hours because it kept relaying mails to thousands of "<some domains>.ru" addresses!
What is the quickest way to "close" its "openness?"
I've already tried the various "smtpd_client_restrictions, ...sender_restrictions, ek-ek, to no avail. "
I've gone around the world thru cyberspace, but all the solutions I've seen, including pop-before-smtp, haven't closed all the holes!
-samboy
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