This add on lets you submit post from frontend.
When active, this plugin adds a settings page in UsersWP > Addons > Frontend Post
Admin can change settings like enable form for guest user or not. If enabled for guest then user will have to enter name and email and based on that new user will be created and post will be assinged to that user.
Admin can select post status from pending, draft and publish.
Admin can change the success message and error message for form from settings page.
Admin can enable/disable, change subject and change content of email notifications for users and admin from UsersWP > Notifications
Use Recaptcha add-on to enable captcha on frontend post form. Admin can enable/disable captcha on this form from the settings page of Recaptcha add-on.