The document summarizes a research study on global email deliverability conducted by Return Path from July to December 2009. Some key findings include:
- Non-delivery rates remained high, with as much as 20% of commercial emails not reaching recipients globally. Delivery rates varied by region and country.
- Reaching business inboxes in the US and Canada was still difficult, with only 75.2% of emails delivered to the inbox through enterprise email systems.
- Delivery rates varied significantly depending on the specific ISP and country. Some ISPs had non-delivery rates over 50% while others were below 5%.
- Three main reasons for ongoing deliverability issues were identified: overreliance on bounce