Methodology
All metrics derived from anonymized aggregate data across Inbox OSS customers between May 2025 and April 2026. Minimum 50 senders per vertical; minimum 1M sends per vertical for inclusion.
SaaS
Open 28.4% · Click 3.1% · Bounce 0.6% · Complaint 0.03%. Strong engagement, low complaint. SaaS senders typically have engaged audiences from product signup.
E-commerce
Open 22.1% · Click 2.8% · Bounce 0.9% · Complaint 0.06%. Slightly higher bounce and complaint rates reflect cold acquisition email patterns.
Fintech
Open 34.2% · Click 4.2% · Bounce 0.3% · Complaint 0.02%. Transactional-heavy mix drives the highest engagement and lowest complaint rates in the dataset.
Media
Open 31.5% · Click 5.7% · Bounce 0.4% · Complaint 0.04%. High click rate reflects content-focused newsletters with clear CTAs.
Education
Open 36.8% · Click 4.9% · Bounce 0.7% · Complaint 0.02%. Mission-aligned audiences engage at the highest rates of any vertical.
Healthcare
Open 40.1% · Click 3.4% · Bounce 0.5% · Complaint 0.01%. Highest open rate; lowest complaint rate. Audiences treat healthcare email as high-trust.