When sending an email, under the "send/schedule" tab where you can select a list, it'll always show you the estimated number of recipients (see the image) as well as how many recipients won't be incuded in the email. In addition to the "learn more" link, if we can have a link to the accounts that would be excluded from the mail, and the reasons, that would make things a lot easier to understand why they're not included. Currently we can find this info out only after we send the email (ie reactively) or by playing with the filters of the list (time-consuming).
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