Deliverability briefing, Wednesday, 26 August 2026
DMARC enforcement holds at 88.4% with no new deliverability story
Nothing changed in the headlines today. Emailchaser's daily DNS check found DMARC enforcement at 88.4% across the measured panel, and Proofpoint remained the most common inbox provider at 33.7%.
Inbox Rules Index
Measured Wednesday, 26 August 2026
DMARC enforcement across Emailchaser's panel of 499 business domains stands at 88.4%, up 0.2 percentage points from 88.1%. This tracks the domains you send to, not customer sending data.
Who filters their mail: Proofpoint 33.7%, Microsoft 365 26.1%, Google Workspace 18.8%, Self-hosted or other 9.8%.
Changed since 2026-08-15: apollo.io DMARC policy quarantine to reject; lloydsbank.com mail provider Self-hosted or other to Microsoft 365; thermofisher.com SPF policy neutral to soft; walgreens.com mail provider Cisco Secure Email to Mimecast; zimmerbiomet.com DMARC policy none to quarantine; zoho.com SPF policy strict to missing.
499 of 499 panel domains resolved today. A fixed panel of real business domains, measured every day over public DNS. This is a measurement of the domains a sender emails, not of Emailchaser customer sending data.
Questions senders asked today
What is DMARC enforcement today?
DMARC enforcement across Emailchaser's panel of 499 business domains is 88.4% on 26 August 2026, up 0.2 percentage points from 88.1%.
What is the most common inbox provider in the panel?
Proofpoint is the most common provider, covering 33.7% of Emailchaser's measured domains, followed by Microsoft 365 at 26.1% and Google Workspace at 18.8%.
How strict is SPF across the panel?
SPF is set to strict alignment on 42.7% of measured domains, while 1.2% of domains are missing an SPF record entirely.
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