On 3/2/2012 1:46 PM, Gary Chambers wrote: > All, > > I had a piece of spam slip through this morning and I'm hoping it's > beneficial > that I post this information. Specifically, I'm wondering why the > mail was > delivered from a host without rDNS. The relevant portion of the log > is as > follows: > > Mar 2 10:28:52 lollipop postfix/smtpd[3621]: warning: > 88.151.91.185: hostname ab88-151-91-185.mxc.ru verification failed: > Name or service not known
Postfix says the client has rDNS, but the hostname has no matching A record. ... > postconf -n output is as follows: > ... > smtpd_client_restrictions = permit_mynetworks, > permit_sasl_authenticated, check_client_access > hash:/etc/postfix/client-access, > reject_unknown_reverse_client_hostname, reject_rbl_client > zen.spamhaus.org, reject_rhsbl_client dbl.spamhaus.org reject_unknown_reverse_client_hostname will not block this host since it has rDNS. -- Noel Jones
