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Record, rather than the more common "A" record. Here'sĪ list of spam databases which can be queried via DNS:įor some of these, the client needs to retrieve a DNS "TXT" There are a number of spam filters and such whichĬreate special DNS entries that can be queried. I'd like to query some DNS-based services from a FirefoxĮxtension. Is limited to IP address (A-type) DNS queries? 'Killing That Spam With Postgrey And Postfix | HowtoForge - Linux 'How To Block Spam Before It Enters The Server (Postfix) | HowtoForge. The question is now: do you still have "proper" spam-protection rulesįor your postfix, e.g.
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> name->address mapping does not match the client IP address." > IP address->name mapping fails, 2) the name->address mapping fails, or > reject_unknown_client_hostname, which rejects a request when "1) the The *client* host above is being rejected because of > reference to reject_unknown_helo_hostname, and thus unrelated to the > As clearly documented in postconf(5), reject_unknown_hostname is a
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> 'Forward-confirmed reverse DNS - Wikipedia, the free encyclopedia' > restriction would say "HELO command rejected. > because the logged message says, "Client host rejected. > In your case, it was probably #2 or #3 in warn_if_reject mode, reject_unknown_client_hostname rejects if the FCrDNS fails. reject_unknown_reverse_client_hostname rejects if there is no PTR > hostname, rejects if that fails to resolve. reject_unknown_hostname is the deprecated form, now known as > You seem to be confusing several restrictions here. Mailing list, the explanation and the 2 possible causes were there: (that's why postfix will lookup /etc/hosts file).Īlso if you would have read the link I posted from postfix google It seems I was right - the disable_dns_lookups option is used toĭisable those checks for LAN clients which might not have a reverse dns > for some reason turning off the dns_lookup didn't do the job. > remove smtpd_client_restrictions = reject_unknown_client > i've also contacted my hosting provider with the same question. As long as you can not execute the advice ken_yap gave you That is not the one to be tested because then no mails would ever beĮxcepted from all those people having a local domain.
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Goes via our provider) originated on her system in our local domain. That a mail from my wife (on another system in the LAN, but the mail When I look into the info that accompanies a mail, I can indeed see Mail, but that domain does not exist on the Internet at all. I do not know who puts that domain where in the Into your su terminal? You do not even have to read it, just cut and How difficult can it be to cut what we say from the thread and paste it This is the third upper/lowecase mutation in this story: Or is there another way (appart from contacting the sender and let them (this case, and the other email were both from aīuth how can i turn off the reverse dns lookup in postfix.
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Provider) they where able to tell me it has something to do with the Sep 7 11:46:29 SkynetServer postfix/smtpd: disconnect from unknownĪfter some email contact with (netherland's biggest telecom Sep 7 11:46:29 SkynetServer postfix/smtpd: NOQUEUE: reject: RCPT from unknown: 450 4.7.1 Client host rejected: cannot find your hostname, from= to= proto=ESMTP helo= Sep 7 11:46:28 SkynetServer postfix/smtpd: connect from unknown Sep 7 11:46:28 SkynetServer postfix/smtpd: warning: 193.172.49.136: address not listed for hostname I figured out that at least 2 emails were not delivered to me this