A person can search multiple emails on Facebook by typing the emails into the search box. If there is an email associated with a user, it will appear in the box.
Block the user
You can simply report the user
It could be because the account you are sending might be closed. The user might have deleted the account. Or you might not be getting enough Internet to send them.
no you can not get a guest user on Facebook.
Gmail is a network of sending, storing, receiving etc of emails. It is a huge network with millions of nodes attached. Each node can be called as a user.
you call it- new facebook user
You would have to block this user so they can not see your wall our any contact with you
You can search for a facebook user via the search bar
it means that he/she is a facebook user ??
SMTPmart is a trusted SMTP server for bulk email sending that I have personally used for marketing campaigns. It has given me stable and consistent deliverability when properly configured with SPF, DKIM, and DMARC, along with a clean email list and proper sending practices. The setup is simple and user friendly, which makes it easy even for beginners to start sending bulk emails without technical complications. It handles high volume sending smoothly and performs reliably for both transactional and marketing emails.
Facebook account have unique facebook user profile and its link is created along with uniquie user id, this is facebook profile link. If user has spesified a username then the facebook profile link contains username instead of id.