On Fri, Apr 28, 2023 at 06:38:04PM +0200, Jaroslaw Rafa via Postfix-users wrote:

> Also take into account that many countries use two-level domain registration
> scheme ...

In Japan, 3rd-level public suffixes are quite common, taking the form:
<domain>.<city>.<prefecture>.jp.

For example:

    hospital.hekinan.aichi.jp. MX 10 mwbgw2.ocn.ad.jp.
    hospital.hekinan.aichi.jp. MX 10 mwbgw1.ocn.ad.jp.

And there's even:

    pike.pvt.k12.ma.us. MX 100 thepike.ne.client2.attbi.com. 

delegated from the PSL-listed 4LD:

    pvt.k12.ma.us

-- 
    Viktor.
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