ML put forth on 11/23/2009 7:33 PM: > I am still confused.
If you are truly worried about your sending IPs/domains being blacklisted for mismatched A and PTR records, then I suggest you bind an IP to your NIC for each domain you plan to handle and create a matching A and PTR in DNS for each IP/domain. Then, you'll need to setup a separate instance of postfix for each IP/domain so that each domain sends out only 1 IP address. However, this is silly. There are many postfix and other MTAs out there hosting hundreds and sometimes thousands of domains from a single IP with a single PTR, and they're not getting blacklisted by the dnsbls. Sending spam will get you blacklisted. Sending backscatter will get you blacklisted. Having mismatched A and PTR records will _NOT_ get you blacklisted. If might get you deferred by Yahoo for longer than you might like, but that's about it. Try the easy route first, which is option #2 I list above. If you have problems with delivery due to mismatched A/PTR, _then_ reconfigure for option #1. -- Stan
