DMARC
On hostOK
v=DMARC1; p=reject; rua=mailto:dmarc@grammarly.com; adkim=s; aspf=s; pct=100
- Policy: reject
- Alignment: adkim=s, aspf=s
- pct=100
- rua=mailto:dmarc@grammarly.com
Explain this
What: DMARC tells receivers what to do when mail fails authentication & alignment.
Why: Enforcing DMARC protects your brand and unlocks BIMI logos.
Policies:
p=none
– Monitor only; meets minimum sending, but doesn’t protect your brand.p=quarantine
– Failing mail goes to spam (receiver discretion).p=reject
– Failing mail is rejected outright.
Reports (rua): Aggregate XML reports surface failures (incl. sender requirements). Example:
<policy_evaluated> <disposition>none</disposition> <dkim>fail</dkim> <spf>fail</spf> <reason> <type>local_policy</type> <comment>Sender requirement failed: 550-5.7.1</comment> </reason> </policy_evaluated>