The review notes that the origin of the data is unclear. "Mail Access" can sometimes imply credentials rather than just contact info; if this is the case, it carries significant legal and ethical risks. 4. Utility & Recommendations

10,000 entries. This is a substantial "starter" size for a campaign, allowing for statistically significant A/B testing.

Without a validation report, the "Mail Access" claim needs testing. In lists of this size, you should expect a bounce rate of 10–15% if the data hasn’t been scrubbed recently.