[Pdns-users] BIND-Zonefiles: @ vs blank
b.candler at pobox.com
Thu Aug 8 14:19:42 UTC 2019
On 08/08/2019 14:09, Michael Loftis wrote:
> we have a zonefile which got recently added TXT entries for SPF
> and DMARC:
> _dmarc IN TXT "v=DMARC1; p=none; rua=mailto:foo
> IN MX 10 mx.domain.tld.
> IN TXT "v=spf1 include:spf1.domain.tld ?all"
> Since then, requests for the MX record were not answered any more,
> adding a @ fixed it.
> I'm wondering now why this happens, as in other zonefiles without TXT
> records the blank substitution works.
> I've always had the understanding that blank meant "reuse last" so by
> adding the _dmarc TXT record ahead of the blank records you
> inadvertently moved them to be _dmarc.ZONE
You are correct. All three records shown above are for _dmarc.ZONE
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