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Email marketing is a blood sport. In the last 20 years, the only thing that’s changed with email is that good email senders continue to get punished more and more by email service providers. While ISPs and ESPs could totally coordinate if they wanted to, they simply don’t. The result is that there’s an adversarial relationship between the two.
… of any kind, it’s worth asking the vendor when the panel was last updated. Survivor Bias is an issue you don’t want seeping into your panel. Again, check with Return Path. As for inbox placement, the problem is often that panel data will show less than 100% inbox placement at Outlook and Gmail due to filtering by individual users. As a result…