Re: config files in spamasassin is unintended tlds :/

[Kenneth Porter]

--On Monday, November 05, 2018 12:14 PM -0500 Bill Cole 
<sausers-20150...@billmail.scconsult.com> wrote:

FWIW, BIND 9.x (since 9.4-ish) will parse and load a zone with such an A
in it, but complains and does not serve the record: NXDOMAIN for a normal
query, no hint of it in a zone transfer.

BIND's check-names directive controls whether a zone permits underscores.

<http://www.zytrax.com/books/dns/ch7/zone.html#check-names>