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
Gynophobia :D
Triskadekophobia.
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
Mainly a phobia.
social phobia
Anorexia nervosa
a fear or phobia