Hello Joni, Thank you for your suggestion and quick reply.
Well, my actual log entry has been posted in my first message. I only changed the actual IP address. The log is: Postfix says, "hostname verification errors in FCrDNS: Does not resolve to address 123.45.67.8 123-45-67-8.my.isp.com” Now here is the exact copy-paste if it wasn’t really clear for you from the first time: ---------------Hostname verification errors (FCRDNS) ------------------ Does not resolve to address 123.45.67.8 123-45-67-8.my.isp.com --------------------------------------------------------------------------------------- The domain names were not required in my question therefore I did not use any of them such as example.com and so on so there isn’t much for you to translate . I have a "business" type account and the reverse DNS is available. In fact, It even works OK but only one way. The thing that is not working as per my log entry is the other way around, that is the FCrDNS. I’ll double-check it with my ISP one more time on that though. However, my question was if I could possibly solve it using only postfix without getting my ISP involved because as I have already said in my previous message Postfix has been working absolutely fine without any problems with delivery or anything else. I’ve been trying to fix it using check_reverse_client_hostname_access but this does not seem to solve the issue. Would highly appreciate any other / more options, comments, assistance. Many thanks! Regards, Dennis. > > >First off, for the best assistance, post the actual log entries for the >warning, instead of a generic description. Too much information tends to get >lost if people 'translate' :-) > >And if you do use domain names in your examples, make sure they are the actual >values, or something appropriate for example use, like 'example.com'. As >documented here; > >http://tools.ietf.org/html/rfc2606#page-2 > >As for a fix, check whether your ISP supports setting the reverse DNS for your >IP address. This may be a feature that comes with a 'business' type account, >or they may not support it at all. If it's not supported, the general >advice >is to send outgoing mail via the SMTP servers provided by your ISP, to avoid >issues with delivery. > >Mvg, >Joni From: DTNX Postmaster Sent: Friday, June 27, 2014 12:12 To: postfix users Subject: Re: Postfix and Generic rDNS On 27 Jun 2014, at 10:53, Klaipedaville on Google <klaipedavi...@gmail.com> wrote: > I have a quick question / request for clarification. I’ll try to be concise. > > 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." > > 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” > > Any free FCrDNS online service also shows and says the same thing, that is > that rDNS is not forward confirmed or PTR is generic. The IP address is > static. > > Postfix is working OK but this warning is simply always there as I have no > control over my ISP. Would appreciate any suggestions / advices / pointers on > how do I fix it? Many thanks in advance!
