Strict SPF alignment is on
NOTEWhat it means
aspf=s requires the SPF-authenticated domain to match your From domain exactly. Subdomain senders and some forwarding paths will fail DMARC as a result.
How to fix it
Confirm every sender uses example.com exactly in the envelope sender, or switch to aspf=r.
Check your own domain
This page describes the condition. To find out whether your domain has it, run the DMARC test or the full checkup, which examines every record at once.
Understand it properly
This page covers one condition. For the whole picture, The DMARC guide, from a first record to enforcement, or start at the Health Library.
Where this comes from
We judge this against RFC 9989 section 4.7. Every finding on this site cites the specification behind it so you can check the work rather than take our word for it.
Other DMARC conditions
DMARC_ASPF_STRICT_ADV
Every fix on this site is yours to implement. If you would rather someone did it, I take this work directly.