[Pdns-users] BIND-Zonefiles: @ vs blank

Brian Candler 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
>     <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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