Newsletter Nulled is the most advanced newsletter plugin for WordPress: it manages everything from user subscriptions to email automations, from follow up notifications to list building. You can add even more powerful features through our premium extensions.
If you’re using the plugin Post SMTP, be aware that the “return path” set on Newsletter GPL Settings is not respected. If they can add an option to set that value (we should call it “Sender” but is a bit misleading for nontech humans), the return address needs to be set in that plugin.
To instruct externals to send error messages in the right mailbox, you need to configure the “return path” on Newsletter Free Download main settings with the email address you created in the previous step.