Hi Justina - Thanks for this great suggestion. To clarify do you mean a report based on the email client (vs recipient's domain?)
You can get a report today by database, of the domains in your database.
Just go to: Statistics -> Contact Database Statistics, select a database and then click the 'Top 10 Domains' tab in reporting.
this will display a report by domain.
We have implemented this in release #32.
Under Stats -> Database Stats we now report the open / engagement rates for your top 10 domains (by recipient count).
Justina Cerra
A feature that would be super helpful is the ability to run a domain report by list or by database for an easy reporting system to see which email platforms are being used by our subscribers. This would be so helpful in helping us understand the habits of major service providers vs. private business accounts and other statistics.