Email Deliverability Research
Original data on email authentication health across real domains.
SPF Mistakes Report 2026: What Goes Wrong and How Often
July 2026 · By The InboxGreen Team
We analyzed 1,247 domains for SPF configuration problems. 32.1% had at least one issue. Softfail accounted for 72% of all problems, and 61% of those domains also had weak or missing DMARC.
Email Authentication Report 2026: 186 Domains Checked
June 2026 · By The InboxGreen Team
We scanned 186 well-known SaaS, e-commerce, and email tool domains for SPF, DKIM, and DMARC health. Only 69.4% passed all three checks. See who failed and why.