Warmup green but emails in spam - root cause deliverability diagnostics

Warmup green but emails in spam - root cause deliverability diagnostics targets a $4.2B = 300,000 businesses with outbound programs x $14,000 ACV average (mix of SMBs paying $3k-$8k and mid-enterprise plus agencies paying $25k-$100k for deliverability tooling and services) total addressable market with medium saturation and a year-over-year growth rate of 12-18% email and martech spend growth driving more spend on deliverability and analytics.

Key trends driving demand: ISP strictness -- Gmail, Outlook, and others continuously refine filters so static warmup metrics fail to predict outcomes; Higher outbound volume -- growth in cold outreach and account based sales increases deliverability risk and need for diagnostics; Programmatic inbox testing -- APIs and services for inbox placement and seed lists are mature enough to enable automated testing at scale; DMARC and authentication adoption -- more domains enforce stricter authentication, increasing need for domain-level diagnostics.