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).

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