The fear of rejection is commonly referred to as "rejection sensitivity" or "rejection phobia." In psychological terms, it may also be connected to conditions like social anxiety disorder or avoidant personality disorder. Individuals with this phobia often experience intense anxiety in social situations, fearing that they will be rejected or not accepted by others.
A phobia of small spaces is called claustrophobia.
Ntomataphobia
From what I understand there is no specific phobia for people who are afraid of mail. Most just call it Mail Phobia...
laceaphobia
Triskadekophobia.
Gynophobia :D
I am not sure of the name but yes, people can have a phobia of anything, for example, my friend is scared of tomato ketchup.
In the Philippines we call it Bigscotsjessieitus
Anorexia nervosa
a fear or phobia
Telephobia of course.
social phobia