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I have installed this plugin on 3 multisite networks and experienced the same issue.
When I install & network activate the plugin, and configure it in the wp-config.php file, using mailgun, the emails and the plugin works BUT in the plugin settings, the Test Email button is deactivated and it says,
“Send Email You cannot send an email. Mailer is not properly configured. Please check your settings.”
This does not happen when I only enable the plugin on a single site-by-site basis. But I do not wish to have to edit the settings on each and every site.
I believe this bug only affects the Test Email settings and not the main functionality of the plugin. But, I have seen it consistently in three different multisite implementations, so it does seem to be a bug.