Am 27.06.2014 10:53, schrieb Klaipedaville on Google: > My ISP has a generic rDNS. For clarity I’ll say that it is defined as > follows, "Generic rDNS means that a DNS query > on the IP address resolves to something like: 123-45-67-8.your.isp.com. The > opposite of generic rDNS is a "unique > reverse pointer" which is usually something like mail.your-domain.com."
in general bad - i tend to block such PTR's because the postmaster finds not worth to care about a clean reputation and if i face too much spam from other "*.your.isp.com", well you have to bite it if your IP is from a eastern country i don't hestitate a second and place the whole /16 subnet of your ISP on the RBL in case of spam delivery > Now my postfix always warns me due to this generic rDNS of my ISP. > > Postfix says, "hostname verification errors in FCrDNS: > Does not resolve to address > 123.45.67.8 123-45-67-8.my.isp.com” PTR and A don't match > Postfix is working OK but this warning is simply always there as > I have no control over my ISP then switch to a different ISP or move your mailserver somewhere in a datacenter (rootserver, VPS....)
