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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