With this plugin You are able to display the mailing lists and/or the user groups at the footer of the newsletter, to which the newsletter was sent to.
You may set, if the number of recipients per mailing list or user group shall be listed. This naturally only works, if the listing of mailing lists/user groups is activated.
Finally You can set, if the total of all recipients shall be displayed.
This works for preview, for test sending and certainly for real sending. At the preview and test sending the plugin cannot know, whether the real sending shall also go to unconfirmed subscribers. Thus the summary of recipients only counts confirmed subscribers. Archived subscribers never are counted, to them the newsletter is never sent.