On 2017/08/10 20:18, Walter Alejandro Iglesias wrote: > In article <e2a8ebd4dc750...@server.roquesor.com> you wrote: > > Hi Stuart, > > > > In article <slrnoop1rc.31bc....@naiad.spacehopper.org> you wrote: > > > On 2017-08-10, Rui Ribeiro <ruyrybe...@gmail.com> wrote: > > > > An email server in a residential setting will fail PTR unless you are > > > > working with a medium sized/an ISP that cares about their customers. > > > > > > > > see answer here > > > > https://unix.stackexchange.com/questions/371329/bind-proper-reverse-config > > > > > > You can't expect to reliably deliver email unless you have a PTR record > > > and > > > an A/AAAA record (at least within the same domain, though in some cases > > > the full hostname needs to match). > > > > > > > At this point things got a bit confusing. First of all I don't run my > > own DNS server, I use the free dns service from the registrar company > > where I bought my domain names. There I configured the records I need > > for the web and mail servers I run at home. Then, asking my ISP to add > > a PTR record on *their* DNS was the first thing I did when I contracted > > the service, and was the first thing I checked again last weekend after > > the problem I explain in this thread happened. Despite the negative > > results the website someone recommended me shows (dnsinspect.com) I > > think my PTR is working well, you can use host(1), dig(1) or nslookup(1) > > to check my IP (185.37.212.61) against yours or any public DNS to > > corroborate it. Or simply put the IP in your browser URL bar, press > > ENTER and see if it resolves to my web site. :-) > > > > Stated the above, now the new question. By A/AAAA records I understand > > you mean the records on *my* side (not my ISP's), don't you? Well, > > since I'm not using ipv6 I didn't added any AAAA record. Do you > > recommend me to add it, anyways? > > > > > > Sorry, I think I didn't formulate the question well. What I meant was, > do I need also a static ipv6 to be considered by big smtp servers as a > legal sender? >
Rephrasing: if you make an outgoing SMTP connection, a reverse DNS PTR record should exist for the source address you're connecting from (whether that's v4 or v6), and an A (for v4) or AAAA (for v6) lookup for the name in that PTR should give back the same address. For your example: 185.37.212.61 -> server.roquesor.com server.roquesor.com -> 185.37.212.61 That looks good. If you are making outgoing SMTP connections from a v6 address, then you should have matching PTR+AAAA as well.
