Yes, it's valid. The SPF record without a terminating "all" mechanism
defaults to implicit ?all (neutral) qualifier if no mechanism explicitly
matches.
https://datatracker.ietf.org/doc/html/rfc7208#section-4.7
- Mark Alley
On 1/31/2025 7:20 AM, Fehlauer, Norbert via mailop wrote:
Hi,
usually there's some kind of "all" mechanism (~all, -all ?all) when using a SPF record
for a domain. Is a SPF record without an "all" mechanism valid at all (implicit +all) or
is this an invalid record in this case?
https://datatracker.ietf.org/doc/html/rfc7208#section-5.1 is not mentioning a "must use"
or "must exist".
As a SPF record is processed from left to right, it should not matter for valid
entries that exist in the SPF record, but there's not statement whtat to do
with non matching hosts.
Anyone can help?
Thanks
Norbert
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