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).
