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Email isn't sent at Vanilla 2.5
Can anyone to fix it?
I'm assuming you can't access the settings page either? /settings/approvalemailsettings/?
You need to add the following addon.json file:
"description":"Sends an email when a new application for membership is received.",
And change "class ApprovalEmailNotification extends Gdn_Plugin" to "class ApprovalEmailNotificationPlugin extends Gdn_Plugin" in default.php.
Could you see if it works after you added some email adresses to that list?
Yes, I couldn't see setting page. After your modification setting item for this plugin has appeared. And system sent message. Thanks. Now it works.