FirstPromoter doesn't have a way to send direct emails to promoters like newsletters(for now, this feature is in progress).
If you want to send direct emails like newsletters or notifications about campaigns changes, you can export your promoters and upload their emails to your email provider.
To keep the emails list of your promoters in-sync, you can use our Zapier integration to add accepted promoters emails to your email provider that you use for newsletters and other emails.