It appears that Grant Taylor via mailop <gtay...@tnetconsulting.net> said: >-=-=-=-=-=- >-=-=-=-=-=- > >On 1/17/22 11:49 AM, Scott Mutter via mailop wrote: >> Do reverse DNS entries support the TXT structure? > >I can't remember the last time I used it to say with any certainty. But >would completely expect that it would. Remember, reverse DNS is simply >a permutation to a forward DNS query to an ARPA subdomain.
There's no technical difference between a reverse DNS zone and any other DNS zone. I have an MX in mine so you can send mail to me at jo...@18.183.57.64.in-addr.arpa, just because I can. BUT ... See my previous message about RDAP. If people want to publish contact info for their IP ranges, they can do it now in the RIR WHOIS. The problem is that they don't want to. Also, in most organizations there is a great distance between the people who run mail servers and the people who run rDNS. As often as not, the rDNS is run by an upstream network, not the operator themselves. So even if it were a good idea to put RP records into the rDNS, which it isn't (see above) the practical obstacles would be huge. R's, John PS: >> Or an IP address has to reverse back to a hostname - put the TXT record >> in that DNS zone. > >I don't think it's good to /rely/ or /depend/ on PTR records resolving >IPs to host names. Dunno about you, but where I am, if an IP does not have matching forward and reverse DNS, that is a very strong signal that it's not supposed to be hosting a server and you don't want to accept mail from it. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
